Polymer composite

FIELD: medicine.

SUBSTANCE: invention refers to polymer composites with the special characteristics used as medical implants, transformed structures, thermal activators and the other commercial structures. The composite comprises a polymer matrix with working temperatures exceeding fibre configuration recovery temperature, and tensile extension min. 2%, reinforced with the elements presented in the form of fibres extended in one or more directions with the fibre length min. 3 times more than the in-between distance, made of a thermal shape memory alloy.

EFFECT: invention enables producing the composite with the polymer matrix wherein high deformation cycle stability, superelasticity or shape-memory effect succeed to be brought together depending on fibre configuration recovery temperatures of the thermal shape memory alloys.

4 cl, 3 ex

 

The invention relates to polymer composite materials with special properties.

Currently, polymer composite materials have found wide application due to the possibility of providing the required properties by optimizing combinations of characteristics are often heterogeneous materials, speakers matrix and a reinforcing element.

There are many compositions and structures of composite materials intended for use as a structural material (Composite materials: a Handbook edited by VLA. - M.: Mashinostroenie, 1990). At the same time, some materials can be used as functional with special properties, such as alloys based on titanium nickelide with thermomechanical memory.

Thermomechanical shape memory includes several manifestations, among which decided to allocate the following (A.A. Ilyin, "Mechanism and kinetics of phase and structural transformations in titanium alloys". - M.: Nauka, 1994.

1. The shape memory effect (ESF), consisting in recovery when heated in the temperature range (Anin-Atoin) the original form, the modified pre-deformation at lower temperatures.

2. Sverkhuprugost (SU) is observed at temperatures above Andtoinin which mate is the real nonlinear deformed to significant amounts (10-15%), and when unloading fully or partially restores its shape.

3. Deformation cyclotouriste (DC) is determined by the material repeatedly (up to 106cycles) to be deformed with a significant (1,5-2%) degrees without failure.

In the patent (US 6989197), which is selected as a prototype to the present technical solution, as described composite material in which the matrix is a rubber, reinforced with particles of an alloy with shape memory effect.

This allows you to increase the strength of the composite material and to provide a homogeneous deformation during loading, but does not provide the possibility of thermo-mechanical memory material or product.

The present invention is to develop a composite material exhibiting thermo-mechanical memory.

The technical result of the invention is the possibility of its use for material and products made with shape memory effect, sverkhuprugost, deformation cyclotouriste used as medical implants, transforming structures, thermoactivation and other structures of the national economic purposes.

The problem is solved due to the fact that the composite material includes a matrix from which alimera, reinforced alloy with thermomechanical memory and reinforcing elements in the form of fibers, located in one or more directions, the fiber length of not less than 3 times the distance between them, and the matrix is made of polymer with working temperatures above the temperature recovery form fibers and elongation at tensile strength not less than 2%.

To ensure the highest deformation cyclotouriste composite material contains fibers alloy thermomechanical memory with temperature recovery form above the operating temperature of the material.

To implement the maximum sverkhuprugost composite material contains fibers alloy thermomechanical memory with temperature recovery form below the operating temperature of the material.

To ensure the greatest recoverable deformation under the effect of the shape memory composite material contains fibers alloy thermomechanical memory with temperature recovery of the shape corresponding to the operating temperature of the material.

The reinforcing elements of the alloy thermomechanical memory in the form of fibers whose length is not less than 3 times the distance between adjacent fibers. In this case, the deformation of the composite material is, or articles thereof, for example angulation, will lead to a deformation of not only plastic matrix and reinforcing fibers.

The matrix material of the composite material should implement thermomechanical memory of reinforcing fibers. For this, he should be allowed to deform themselves not less than 2% without fracture. This value is determined on the assumption that the amount of elastic deformation of conventional structural materials (steel, titanium and aluminum alloys) usually varies within the range of 0.3 to 1.5%, so the use of materials with thermo-mechanical memory, the size of the hyperelastic deformation which is 7-12%, effectively only when the possible deformation of the composite material is not limited ductility of the matrix and exceeds at least 2% of tensile.

In addition, the matrix material should not prevent deformation of the fiber, it should not create a significant counter to its shape recovery upon heating or unloading. In this case, the efforts of the deformation of the material should be at least no higher than the reactive stress recovery form or sverkhuprugost. Typically, for a material with thermo-mechanical memory this value is 15-500 MPa.

The above requirements most closely fits most polymeric materials, that is them as silicone rubber, polyethylene, polyamide, etc. But some of these materials have limitations on the upper limit of the operating temperature (maximum operating temperature), above which leads to a sharp decrease of the mechanical properties of the material, its the act of destruction, etc. Therefore, the maximum working temperature of the polymer should not exceed the temperature of the end of the repair material forms.

The shape and arrangement of reinforcing fibers in a polymer matrix can vary in quite a wide range. For the implementation of the shape memory effect and the effect of sverkhuprugost the composite material may be reinforced in one direction. In this case, the deformation of the material or its products should be carried out so that the stretching or compression along the fiber (tensile axis of the fiber, bending across the grain and so on). When using more complex schemes deformation of composite fiber material in it should be placed in several directions or chaotic. In this case, the reinforcing fibers may form a grid of different weave or felt.

To provide the composite material with the required characteristics, use of reinforcing fibers from a material with thermo-mechanical memory with defined temperature reverse martensitic transformation from siteline operating temperature composite material. Thus, to implement the most comprehensive sverkhuprugost composite material it should be reinforced with fibers of a material with temperature recovery form below the temperature of its operation. In this case, the deformation of the composite material at the temperature of operation will lead to the implementation of sverkhuprugost in the fibers and restore the form of a composite material or products from it when unloading.

To implement the highest deformation cyclotouriste composite material of reinforcing fibers must be made of a material with temperature recovery form above the temperature of its operation. In this case, significant cyclic deformation of a composite material (10-12%) will not lead to the destruction of fibers and loss of strength.

To ensure the greatest recoverable deformation during the implementation of shape memory effect material should be reinforced with fibers of a material with temperature recovery form, corresponding to the temperature range of operation. In this case, the deformation of the composite material and the heating is in the range of operating temperatures will cause the maximum realization of the shape memory effect.

An example of the use of the composite material with high deformation cyclostomi the awn may be ectoproct brush, which is usually made from a silicone matrix, reinforced with steel wire. However, repeated attempts to change the provisions of the fingers ectoprocta to provide a more comfortable grip, for example when driving or sports and everyday activities is the destruction of the fibers, resulting in the need to replace ectoprocta.

Example 1

Was made ectoproct brush silicone matrix with a working temperature up to 200C and elongation at elongation of more than 200%, as reinforcing fibers used wire with a diameter of 3 mm and 4 mm from an alloy based on titanium nickelide (TN composition: Ti - 55.8% of Ni by mass), temperature recovery form which was Asnin=95C Andtoin=105C. the Fibers had a length of from 180 to 230 mm, and arranged in parallel at a distance of 10-15 mm

Ectoproct actively used for more than one year with multiple changing the position of the fingers and bend the brush without any signs of failure.

Example 2

Composite material with sverkhuprugost used for the manufacture of medical implants, maintained at body temperature. It was made sternum implant used in thoracoplasty oncological diseases of the chest. As the matrix was used ultra-high molecular weight pole is strong with operating temperature up to 90C and elongation at tensile strength up to 20%, reinforced grid of perpendicular fibers alloy TN diameter of 1 mm, with temperature recovery form Andnin=15C Andtoin=25C. the Fibers had a length of from 80 to 250 mm and was located at a distance of 5-10 mm from each other in the axial and transverse directions. After resection of the affected area of the sternum and part of the edges of the implant podshivalsya a ligature to the remaining parts of the ribs and the sternum, providing tightness and integrity of the thorax.

Example 3

Composite material, fully realizing the shape memory effect, was used for the manufacture of transforming the design of storage tanks for liquid.

Fiber alloy Cu - 14%Al - 4%Ni was a wire diameter of 0.2 mm twisted by type of satin with a mesh size of about 1 mm (i.e. the length of the fibers is not less than 5 times the distance between them) and placed in a polyethylene matrix with operating temperature up to 60C and elongation under tension up to 60%. Fiber alloy Cu - 14%Al - 4%Ni have temperature recovery form Andnin=30C Andtoin=35C. From a composite material made airtight container in the form of a flat canister, which is at a temperature below 30C can be fairly easily crushed to reduce its volume. As such, the capacity is the Alo. If necessary, it is heated to temperatures above 35C, such as a Hairdryer, and through the implementation of shape memory effect restores its shape and can be used for storing liquids. After using it again can be crushed and stored in this form until the next operation.

Thus, the present technical solution allows to obtain a composite material with a polymer matrix in which depending on temperature recovery form fibers alloy thermomechanical shape memory it is possible to realize high deformation cyclotouriste, sverkhuprugost or shape memory effect.

1. Composite material comprising a matrix of polymer, reinforced by elements of the alloy thermomechanical memory, characterized in that the reinforcing elements are in the form of fibers, located in one or more directions, the fiber length of not less than 3 times the distance between them, and the matrix is made of polymer with working temperatures above the temperature recovery form fibers and elongation at tensile strength not less than 2%.

2. Composite material according to claim 1, characterized in that to ensure the highest deformation cyclotouriste it contains fiber alloy thermomechanical memory with temperature for restoring the Oia forms above the operating temperature of the material.

3. Composite material according to claim 1, characterized in that in order to realize maximum sverkhuprugost it contains fiber alloy thermomechanical memory with temperature recovery form below the operating temperature of the material.

4. Composite material according to claim 1, characterized in that to ensure the greatest recoverable deformation under the effect of the shape memory it contains fiber alloy thermomechanical memory with temperature recovery of the shape corresponding to the operating temperature of the material.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing multimodal polyethylene. The method is carried out in at least two reactors which are connected in series, where 20-80 wt % of a high-molecular weight polymer is obtained in a suspension in a first reactor and 20-80 wt % of a low-molecular weight polymer is obtained in a suspension in a second reactor. The ratio of the average effective concentration of substance in the reactor of the low-molecular weight product to the average effective concentration of substance in the reactor of the high-molecular weight product is 0.25-1.5. The average effective concentration of substance in each reactor is defined as output of polyethylene obtained in the reactor (kg PE/h)/[concentration of ethylene in the reactor (mol %) dwell time in the reactor (h) rate of feeding catalyst into the reactor (g/h)]. The dwell time is defined as the mass of the polymer in the reactor (kg)/rate of removal of the polymer from the reactor (kg/h). The volume of the second reactor is at least 10%, preferably at least 30%, and even more preferably at least 50%, greater than the volume of the first reactor. The ratio of the length to the diameter of the first reactor L/D(1) is greater than that of the second reactor L/D(2), and is preferably greater by at least 20%.

EFFECT: method of producing multimodal polyethylene in two reactors with optimum ratio of dimensions.

15 cl, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a wood substitute material for wood-encased pencils. The wood substitute material for wood-encased pencils contains the following, wt %: 15-30% of at least one polymeric binder from a group of polyolefins, 50-80% of at least one organic filler from wood and/or cellulose with maximum particle size of 100 mcm and 0-20% by weight of at least one inorganic filler, 0.5-5% of at least one adhesion promoter, 1-30% of at least one wax, 0-10% of at least one colouring pigment and 0-10% of at least one additive. Total amount of the organic and inorganic filler is at most 80 wt %. The adhesion promoter is formed from polyethylene or polypropylene with grafted maleic anhydride, or from a copolymer of ethylene and maleic anhydride and forms a chemical bond between the polymeric binder and the organic filler. The ratio of the adhesion promoter to the wax ranges from 1:2.5 to 1:6.

EFFECT: wood substitute material for wood-encased pencils has high bending strength, wear resistance and is easy to sharpen.

16 cl, 3 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to composite material which can be used to protect surfaces of excavator buckets, hoppers, dump truck bodies and other mechanisms from abrasive wear under impact loads. The material is obtained by mixing mechanically activated ultra-high molecular polyethylene and aluminium oxide powder Al2O3. The aluminium oxide used is aluminium oxide Al2O3 of the corundum modification of two fractions with particle size of 0.1 mm and 0.3 mm in ratio 1:2 and in total amount of 18% of the weight of the ultra-high molecular polyethylene.

EFFECT: material for lining plates has high impact strength and wear resistance.

1 tbl

Polymer composition // 2476458

FIELD: chemistry.

SUBSTANCE: invention relates to composite polymer materials based on synthetic butadiene rubber and can be used in cable and footwear industry. The polymer composition contains the following, pts.wt: butadiene rubber SKD-35 80, high-pressure polyethylene 20, sulphur 1.6, zinc oxide 2.4, santocure 0.72, stearine 0.8, technical carbon 0.1-5.37. The amount of technical carbon is calculated using the formula c= 0.1en, where n=0,1,2,3,4, e=2.7.

EFFECT: disclosed polymer composition has high operational characteristics: strength, dynamic and mechanical properties, modulus of elasticity and dielectric properties.

7 dwg,1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing multimodal polyethylene. The method is carried out in at least two reactors with circulation, which are connected in series, where 20-80 wt % of a high-molecular weight polymer is obtained in a suspension in the first reactor and 20-80 wt % of a low-molecular weight polymer is obtained in a suspension in the second reactor. One polymer is obtained in the presence of the other in any order. The ratio of the average effective concentration of substance in the reactor of the low-molecular weight product to the average effective concentration of substance in the reactor of the high-molecular weight product is 0.25-1.5. The average effective concentration of substance in each reactor is defined as output of polyethylene obtained in the reactor (kg PE/h)/[concentration of ethylene in the reactor (mol %) residence time in the reactor (h) rate of feeding catalyst (g/h)]. Residence time is defined as the mass of the polymer in the reactor (kg)/rate of removal of the polymer from the reactor (kg/h) and the volumes of the reactors differ by less than 10%.

EFFECT: method of producing multimodal polyethylene in two reactors with optimum ratio of dimensions.

15 cl, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing multimodal polyethylene. The method is carried out in at least two reactors connected in series in the presence of an olefin polymerisation catalyst, where 20-80 wt % of a high-molecular weight polymer is obtained in a suspension in the first reactor and 20-80 wt % of a low-molecular weight polymer is obtained in a suspension in the second reactor in the presence of the high-molecular weight polymer. Concentration of solid particles in the second reactor of the low-molecular weight product, which is defined as weight of the polymer divided by total weight of the suspension is at least 35 wt %, more preferably lies in the range of 45-60 wt %, and/or the ratio of the concentration of solid particles in the first reactor to that ratio in the second reactor is maintained at a level below 1.0, preferably in the range of 0.6-0.8. Volume of the second reactor is at least 10%, preferably at least 30%, and even more preferably at least 50%, greater than the volume of the first reactor. The ratio of the average effective concentration of substance in the reactor the low-molecular weight product to the average effective concentration of substance in the reactor of the high-molecular weight product is 0.25-1.5, where the average effective concentration of substance in each reactor is defined as output of polyethylene obtained in the reactor (kg PE/h)/[concentration of ethylene in the reactor (mol %) x residence time in the reactor (h) x rate of feeding catalyst into the reactor (g/h)]. Residence time is defined as the mass of the polymer in the reactor (kg)/rate of removal of the polymer from the reactor (kg/h). The ratio of concentration of ethylene in the liquid phase (mol %) in the second reactor to that ratio in the first reactor is 5 or less, concentration of ethylene in the second reactor is less than 8 mol % and average volume output (defined as polymer output in kg/h per unit volume of the reactor) in all combined reactors is greater than 100 kg/m3/h.

EFFECT: method of producing multimodal polyethylene in two reactors with optimum ratio of dimensions.

13 cl, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a thermoplastic elastomeric composition based on polyethylene and chlorosulphonated polyethylene, which is meant for pressure moulding and extruding spacers, bushings, gaskets and other industrial rubber articles operating in conditions where they are in contact with aggressive media. The composition is obtained by mixing polyethylene at rotor speed of 50 min-1 until complete melting thereof, after which chlorosulphonated polyethylene is added to the molten polyethylene at rotor speed of 65 min-1. The melt flow index of the composition, which is determined at a load of 15 kg and temperature of 150C, is equal to 0.5-4.99 g/10 min. The composition contains 20-60 wt % polyethylene and 40-80 wt % chlorosulphonated polyethylene.

EFFECT: obtained composition has high resistance to aggressive media and improved physical and mechanical properties.

2 cl, 1 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing a stabilised composition based on low-pressure polyethylene which is meant for blow moulding and pressure casting articles. The method is realised by mixing, in a molten mixture, polyethylenes of different density and additives. The mixture of polyethylenes, taken in granular form, comprises high-density polyethylene and low-density linear polyethylene or high-density polyethylene and medium-density linear polyethylene. The additives are added the composition in form of an additive based on low-density linear polyethylene, which is obtained from a molten granular polymer concentrate. The additive contains a phenol antioxidant which is a sterically hindered phenol, and an ethylene and vinyl acetate copolymer which contains 9-16 wt % vinyl acetate, with the weight ratio of the low-density linear polyethylene to the ethylene and vinyl acetate copolymer ranging from 0.8:1 to 4.3:1. Content of the ethylene and vinyl acetate copolymer in the composition ranges from 0.5 to 1.5 wt % and content of the phenol antioxidant ranges from 0.05 to 0.15 wt %.

EFFECT: stabilised compositions obtained using the disclosed method have an optimum set of physical and mechanical properties and high cracking resistance.

4 tbl, 22 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a polyethylene-based nanocomposite, methods of producing said nanocomposite and can be used in food industry, chemical industry and in medicine when producing novel materials with improved physical and mechanical properties and low gas permeability (high barrier characteristics). The nanocomposite contains low-density polyethylene as a matrix and filler in form of nanoparticles with a general chemical formula [SiO2]k[Si(CH3)2CnH2n+1]m, which are molecular silica sols whose surface is modified with alkyl groups of chemical formula (-CnH2n+1), where n ranges from 10 to 18, k ranges from 10 to 1000, m ranges from 10 to 1000, the ratio k:m varies from 0.5 to 2. The filling ratio of the composite ranges from 1 to 5 wt % with respect to the weight of polyethylene. Molten polyethylene and nanoparticles are mixed in an extruder at temperature 160C-220C.

EFFECT: disclosed nanocomposite has good manufacturability and can be processed using an extrusion method to obtain articles in form of films which are characterised by low oxygen and nitrogen gas permeability.

19 cl, 1 tbl, 7 ex

FIELD: metallurgy.

SUBSTANCE: composition includes high pressure polyethylene, decabromodiphenyl oxide, maleic anhydride, as well as copolymer of ethylene and vinyl acetate, antimony trioxide, magnesium hydroxide modified with organosilanes and Penta-1006 plastic modifying agent.

EFFECT: increasing thermal resistance of polymer composition for fabrication of products using extrusion, die casting and pressing methods at maintaining its compliance with burning resistance category.

2 tbl, 5 ex

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely transplantology, traumatology, general surgery, dentistry, combustiology, plastic surgery, cosmetology. The organ-specific regenerant GI contains a fibrin matrix with thrombin, cryoprecipitate prepared of quarantine fresh-frozen donor plasma. The fibrin matrix is nanostructured and contains thrombolysate enriched by growth factors and cytokines. Cryoprecipitate, thrombolysate and human thrombin in the regenerate are found in equal proportions in the following quantitative relation of the ingredients, mg: cryoprecipitate - 1; thrombolysate - 1; human thrombin -1 0.9%; normal saline - 2 10%; calcium chloride brine -1.

EFFECT: use of the declared method enables higher effectiveness of the recovery of surface and deep wound tissues of a human body.

1 ex, 8 dwg

Bioplastic material // 2458709

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely combustiology, plastic surgery, cosmetology, and can find application as a bioplastic material for skin defect replacement and regeneration stimulation. In the bioplastic material containing a matrix base made of a native form of hyaluronic acid, a frame of the bioplastic material is prepared by the layered lyophilisation of the matrix material to form a space 0.5 to 10 cm thick with fibres of the native form of hyaluronic acid being directed in the porous order and their cells being enriched with thrombocytic lysate with thrombocyte count 1109 thromb/ml.

EFFECT: higher effectiveness of deep wound healing and biocompatibility.

1 tbl, 3 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to surgery and can be used in hernioplasty. For this purpose 40-130 ml of autoblood are sampled during operation, centrifuged for 15-20 minutes, erythrocyte layer is removed. 10% solution of calcium chloride is added to remaining leukocyte-platelet layer of centrifugate and blood plasma. Mixture is shaken up. Mesh allomaterial, prepared by the size of operation wound, is soaked with mixture and sewn in the area of hernial ring. Operation wound is sewn tightly.

EFFECT: method ensures wound healing by primary tension in short terms, prevents development of post-operative complications and can be used not only in hernioplasty but also for covering other operation wounds.

FIELD: medicine.

SUBSTANCE: group of inventions relates to fibre-reinforced composite materials, in particular to oriented in application composite materials, used in dental and medical fields/devices. Solidified fibre-reinforced composite material includes compounded with each other: system of monomers, containing, at least, one solidified monomer, system of filling agents and initiator(s) of polymerisation, and/or polymerisation accelerator(s). System of filling agents contains, at least, one prepreg, containing 0.5-100 mm long fibres, and polymer matrix, and optionally, at least, one powder filling agent, prepreg being located in form of parts, which are 0.5-100 mm long. As fibre, preferably fibre glass is used. Powder filler is selected from common powder filling agents and nanomeric powder filling agents. Claimed is method of said material obtaining and its application in dental and medical field and corresponding devices, in particular, for filling in dental cavities, as filling composites, temporary and semi-permanent composite material for crowns and bridges, filling and binding materials.

EFFECT: composite materials according to invention are stable product, can be applied in requires form and solidified, improved mechanical properties are provided.

26 cl, 3 tbl, 8 ex, 11 dwg

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Described is patch for application in surgery, produced by method, which includes stages of selection of animals tissue, which contains substrate, diametrical linking and fixation of substrate, minimisation of substrate agents activity, substrate tanning and binding of active layer to substrate.

EFFECT: biological patch for surgery does not induce immune rejection and has good biological compatibility.

17 cl, 1 dwg, 1 ex

FIELD: medicine, pharmaceutics.

SUBSTANCE: invention relates to medicine. Described is biological wound covering, produced by method, which includes stages of selection of animal tissue, which contains substrate, of diametrical linking and fixation of substrate, minimisation of substrate agents activity and binding of active layer to substrate.

EFFECT: biological wound covering has good biological compatibility, long-term elasticity, is permeable for gases, but impermeable for bacteria.

20 cl, 1 dwg, 1 ex

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Described is artificial biological implant for nerve guide membrane, made by method, which contains stages of selection of connective membrane of animal, transverse sewing and fixation of membrane, minimisation of activity of membrane antigens, tanning of membrane, connection of active layer to internal surface of membrane, cutting membrane to required shape and size, placement of cut membrane on rod-shaped matrix in such a way that cut membrane took cylindrical shape, and attachment of spiral braid (2) to external surface of membrane.

EFFECT: implant for nerve guide membrane has good biological compatibility.

20 cl, 3 dwg, 1 ex

FIELD: medicine.

SUBSTANCE: in a nanostructured bioplastic material containing a native form of hyaluronic acid, a base is nanostructured hyaluronic acid produced by photochemical cross-link and having a cellular texture in the range of 50 to 100 nm.

EFFECT: higher clinical effectiveness of using the bioplastic material ensured by better adhesion and creating the optimal cell migration conditions in a wound.

1 tbl, 1 dwg

Bioplastic material // 2367476

FIELD: medicine.

SUBSTANCE: bioplastic material includes matrix base of fibrous structure which is a native form of hyaluronic acid and forms a flexible plate. The bioplastic material contains antimicrobial substances.

EFFECT: higher efficiency of wound healing.

2 cl, 1 tbl, 7 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to compositions, with low coefficient of friction for use in friction units of living organisms. Proposal is given of an antifriction composition, containing, as polymer binding mixture (with ratio of components in the binder): methyl methacrylate monomer (27-36 mass units), polymethyl methacrylate polymer powder (72-64 mass units), initiator - benzoyl peroxide 1 mass units (polymer binder A); or a mixture (with ratio of components in the binder): methyl methacrylate (27-36 mass units), copolymer powder (72-64 mass units) with the following content of components: methyl methacrylate - 89 mass units, ethyl methacrylate - 8 mass units, methyl methacrylate - 2 mass units, as well as initiator-benzoyl peroxide - 0.6-1.5 mass units (polymer, binder B) and ultrahigh-molecular polyethylene with 1·106 - 12·106 dalton molecular weight, in powder form (2-15 mass units per 85-98 mass units of polymer binder). Compared to the prototype, the value of coefficient of friction decreases by 2-4 times.

EFFECT: design of a composition, which reduces friction in the maxillotemporal joint of a polymer implant.

3 cl, 4 tbl

FIELD: medicine.

SUBSTANCE: there is described method of obtaining of calcium phosphate nanoparticles, stabilised by salt matrix by interaction of components, first of which contains metal cation, and second contains anion. According to invention as the first component applied is water-soluble calcium salt, and as the second component, soluble orthophosphate, nanoparticles of water non-soluble calcium phosphate being formed, and salt matrix being formed from soluble by-product. Content of calcium phosphate nanoparticles in powder composite "oxide nanoparticles/salt matrix" constitutes 65-82 wt %.

EFFECT: method is aimed at creation of effective nanotechnologies, in order to prevent degradation, that is, aggregations of oxide nanoparticles of calcium phosphates.

5 tbl, 4 ex

Up!