A method of obtaining a polymer fiber-optic pereizluchateley
(57) Abstract:Usage: the invention relates to scintillation technique, in particular to a method for producing a fiber-optic pereizluchateley. The inventive method is that keep the attachment additive (coumarin-30) is introduced into polimerization mixture containing 95-99 wt. of methyl methacrylate, 1-5 wt. alkylacrylate C1-C4the peroxide lauroyl and laurylsarcosine, carry out layer-by-layer polymerization at the rate of 1 to 2 cm/h at 50 to 70°C., and the resulting blocks are subjected to coextrusion with polyporaceae at 190-200°C for 20-30 min to 1 h.p. f-crystals, 1 table. The invention relates to scintillation technique, in particular to a method for producing a polymer fiber-optic pereizluchateley (GPS), which is used to collect light from the scintillator system of scintillation plate-fiber optic preislisten light-optical fiber (light guide) of the receiver.The main quality indicators pereizluchateley are the size of their light yield (length absorption of not less than 100 cm), the effectiveness of the registration passing through the sample particles (the minimum number of photoelectrons should be not less than 1).the Xia is with double-layer fiber containing a core of polystyrene and a shell of polymethyl methacrylate (PMMA), remove the toluene shell and the core in a solution of toluene keep the attachment is applied additive 7 diethylamino-3-(1-methylbenzimidazole-2)coumarin (coumarin-30), then the solvent is removed. Painted fiber in this form is used as VOS. With this method inevitably deteriorates the surface of the core, and keep the attachment additive is distributed over the surface of the fibers evenly. As a consequence, the effectiveness of the registration passing through the sample particles strongly varies along the length of the fiber and gives a large range of indicators, which reduces their light yield (the absorption length is 10-20 cm) and the detection efficiency to 0.7.The aim of the invention is to increase their light yield and efficiency of a particle.This objective is achieved in that in a method of producing a polymer fiber-optic pereizluchateley containing the kernel on the basis of polymethylmethacrylate keep the attachment with the addition of 7-diethylamino-3-(1-methylbenzimidazole-2)coumarin, keep the attachment additive in the amount of 0.03-0.07 wt.h. on 100 wt. including the monomer mixture is introduced into the polymerization mixture contains peroxide of lauroyl, 0.55 to 0.6.h. laurylsarcosine, carry out layer-by-layer polymerization at the rate of 1-2 cm/h at a temperature of 50-70aboutWith and received blocks is subjected to coextrusion with polyporaceae at 190-200aboutC for 20-30 minutesTo further increase the length of the absorption and effectiveness of particle polymerization mixture, you can add 3-5 wt.h. naphthalene.P R I m e R 1. A polymerization mixture containing 95 wt. of methyl methacrylate (MMA), 5 wt. of methyl acrylate (MA), 0.2 wt.h. peroxide of lauroyl (DP) of 0.55 wt. hours of laurylsarcosine (LMC), 0,05 wt.h. 7 diethylamino-3-(1-methylbenzimidazole - Lil-2)coumarin (coumarin-30) cleaned from mechanical impurities method microfiltration and polimerizuet in glass vials by immersing the vials of the reaction mixture at a speed of 2 cm/h in a thermostatic liquid at a temperature of 70aboutC. After complete immersion of the ampoule is maintained at 70about5 h, followed by heating at 120aboutC for 1.5 h to exhaustion of the residual monomer.The resulting blocks are used to form the core bicomponent fiber. As the shell material used fluorine-containing polymer based on tetraterpene 190aboutC and residence time of the polymer in the heated chamber 20 minutesThe quality of the GP was assessed by two indicators: the length of the absorption and the index of efficiency of particle NFeis measured as the value of the segment in cm, on which the light signal will decrease in l times.NFeevaluated as follows: a sample of GPS was installed between the scintillation counters and was exposed to collimated radioactive source EN106. The number of recorded through a sample of photons is calculated NFe.The table shows the values and NFe.P R I m m e R 2. In example 1 using a polymerization mixture containing 99 wt. MMA, 1 wt. ethyl acrylate (EA), the SQUARE of 0.15 wt.h. LIC of 0.55 wt.h. coumarin 30 0.03 wt.h.The polymerization temperature 60aboutWith the speed immersion vials of 1.5 cm/hThe mode of extrusion temperature of 200aboutSince that time 30 min, as the shell material used tetrafluoropropylene (MN-1).Values of parameters and NFeshown in the table.P R I m e R 3. In example 1 using a polymerization mixture containing 97 wt. MMA, 3 wt. of butyl acrylate (BA), 0.2 wt.h. DPS, with 0.55 wt.h. LMC, 0.The mode of extrusion temperature of 200aboutC, 25 min Values and NFeshown in the table.P R I m e R 4. In example 1, but the SQUARE of 0.15 wt.h. LMC 0.6.h. and advanced 3 Mac.h. naphthalene.Values of parameters and NFeshown in the table.P R I m e R 5. In example 1, but additionally contains 5 wt.h. naphthalene.Values of parameters and NFeshown in the table.From the examples it is seen that in the absence of alkylacrylate (example 7), the polymer is not processed by extrusion due to the increase of molecular weight, with the increasing content of alkylacrylate > 5 wt. (example 8) decrease the quality indicators are present. A reduction in the content of the dye (coumarin-30) leads to deterioration in the quality of GP (example 9), and the increase in the content of his impractical (example 10).By reducing the content of PL and LMC (examples 11, 12) increases the molecular weight, the polymer is processed by extrusion, the increase in the content of PL and LMC (examples 13, 14) leads to flare-up blocks and deterioration of their quality.Examples 15-22 illustrate the transcendent values of the modes of polymerization and extrusion.Example 23 shows that used OPTICAL PEREIZLUCHATELEY by the polymerization of vinyl monomer in the presence of a radical initiator and a transmitter circuit to receive the core and then applying acrylic shell on the core, keep the attachment includes Supplement 7 diethylamino-3( 1-methylbenzimidazole-2)coumarin, characterized in that, with the aim of increasing their light yield and the efficiency of the particle, as a vinyl monomer, a mixture of 95 to 99 wt. of methyl methacrylate and 1 to 5 wt. WITH1- C4-alkylacrylate, and carry out layer-by-layer polymerization of this mixture in the presence of 0.03 to 0.07 wt.h. keep the attachment of the additive per 100 wt.h. the comonomers at a rate of 1 to 2 cm/h at 50 70oAnd the shell is applied by coextrusion kernel polyporaceae at 190 200oC for 20 to 30 minutes2. The method according to p. 1, characterized in that the polymerization is carried out in the presence of 3 to 5 wt.h. naphthalene per 100 wt.h. the comonomers.
FIELD: polymer materials.
SUBSTANCE: sheet organic glass is obtained by way of bulk (co)polymerization of (meth)acrylic acid esters in presence of UV absorber, radical polymerization initiator, and light-absorbing additive. Process involves monomer prepolymerization and subsequent final polymerization if mixture in flat-parallel mold. Methacrylic acid esters utilized are, in particular, methyl methacrylate or its mixtures with (meth)acrylic acid or (meth)acrylic acid esters. Light-absorbing additive is methane decomposition product obtained in high-voltage discharge plasma at atmospheric pressure and characterized by loose density 0.65-0.85 g/cm3 and specific pore volume 0.40-0.50 cm/cm3. Additive, taken in amount 0.001-0.01 wt parts per 100 wt parts monomer, is mixed with prepolymer. Resulting mixture is affected by ultrasound and then polymerized in mold until conversion is completed. Sheets manufactured according to invention are suitable for neutral light filters employed in instrumentation engineering, in personal protection devices, and in sporting airplane glazing operations.
EFFECT: improved optical characteristics of glass due to more uniform light transmission in visible spectrum region.
1 tbl, 15 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to manufacturing sheet organic glass based on methyl methacrylate copolymers and used, in particular, in making glass parts of aircrafts. Starting composition comprises per 100 wt parts of methyl methacrylate/methacrylic acid monomer mixture with 0.05-3.0 wt parts methacrylic acid, following ingredients, wt parts: phenol-type antioxidant 0.01-1.0, organic hydroperoxide 0.05-3.0, substituted thiourea 0.03-1.0, and optionally UV stabilizer 0.1-2.0, and/or UV absorber 0.005-0.5, and/or multifunctional (meth)acrylic ester as crosslinking agent 0.1-15.
EFFECT: increased heat resistance of organic glass up to ability to resist for a short time (up to 1h) heating at temperatures up to 240°C without appearance of visible defects such as bubbles and cracks.
4 cl, 1 tbl, 23 ex
FIELD: chemical technology of polymers.
SUBSTANCE: invention describes a plastic molded articles made by polymerization by the molding method of a mixture comprising the following components, wt.-%: methyl methacrylate, 65-99.5; unsaturated carboxylic acid, 0-3; shock-resistant modifying agent, 0.5-35; cross-linking agent, 0-1; stabilizing agent, 0.5-1; initiating agent, 0.001-0.1; lubricant, 0.01-1.0, and regulating agent, 0.001-0.031. In the proposed method a shock-resistant modifying agent is dissolved in methyl methacrylate or partially polymerized methyl methacrylate (syrup) followed by pouring the solution into a chamber. Invention provides preparing the shock-resistance molding material.
EFFECT: improved preparing method, improved and valuable properties of article.
3 cl, 1 tbl, 1 ex
FIELD: chemical industry; aircraft industry; other industries; compositions for production of the Plexiglas.
SUBSTANCE: the invention is pertaining to production by the method of the block radical polymerization of the sheet Plexiglas on the basis of the copolymers of the methylmetacrylate (ММА) for manufacture of the details for the glazing of the flying vehicles. The technical result of the invention is the increased thermostability of the Plexiglas at conservation of its capability of the orientation and molding with elongation of no less than by 100 %. The invention presents the composition including per 100 mass shares of the MMA or its mixtures with other methacrylic monomer, 1.0-4.0 mass shares of triallylisocyanurate, 0.004-0.1 mass shares of peroxidicarbonate and 0.1-0.5 mass shares of tretbutylperbenzoate. The presented composition may contain the mixture of MMA with 10.0-20.0 mass % of the methacrylic acid or the mixture of ММА and 10.0-20.0 mass % of the methacrylic acid and 15.0-25.0 mass % of 4-chlorophenylmethacrylate or cyclohexylmethacrylate. The mixture may additionally contain 0.005-0.25 mass shares of the UV-stabilizer, 0.005-0.5 mass shares of the UV-absorber and 0.01-1.0 mass shares of the lubricant.
EFFECT: the invention ensures the increased thermostability of the Plexiglas at conservation of its capability of the orientation and molding with elongation of no less than by 100 %.
3 cl, 23 ex, 1 tbl
SUBSTANCE: composition for obtaining plexiglass contains 100 pts.wt. methacrylic monomer 0.0002-1 pts.wt. polymerisation initiator, 0.005-0.5 pts.wt. UV absorbers and 2.0-7.0 pts.wt. biphenylmethacrylate. The composition may also contain 0.05-10.0 pts.wt. of a linking agent. Sheets of plexiglass derived from the proposed composition are applicable for glazing parts for aircrafts.
EFFECT: increasing the stability of sheet plexiglass to the action of UV-irradiation while preserving its heat resistance.
5 cl, 1 tbl, 21 ex
FIELD: chemistry, pharmaceutics.
SUBSTANCE: invention relates to the methods of producing biocompatible pharmaceutical polymers. The proposed invention aims at developing the method of producing the copolymers of N-vinylpyrolidone with alkyl acrylates that will allow producing a high-uniform structure copolymers featuring molecular weight varying from 30 to 80 thousands not containing residual monomers and quickly dissolving in organic solvents. In compliance with this invention, for copolymerisation reaction of N-vinylpyrolidone with alkyl acrylates, it is proposed to prepare two solutions, i.e. an initiator in N-vinylpyrolidone (solution A) and that in the mix of N- vinylpyrolidone with alkyl acrylates (ratio varying from 5 : 95 to 15 : 85 wt %) (solution B) to carry out copolymerisation at temperatures from 70 to 90°C in the medium of organic solvent by gradually adding 4 to 8 various mixes of monomers resulted from mixing of aforesaid solutions A and B for 2 to 4 hours along with gradual changing of the N-vinylpyrolidone-to-acryl acrylate ratio from 95 : 5 to 10 : 90 wt % with the subsequent cooling down of reaction mix to 30 to 45°, followed by adding a precipitator till the formation of a coacervate solution of a copolymer and, with the subsequent decanting of the solvent-precipitator mix and drying of coacervate solution at residual pressure of 1 to 8 kPa at 65 to 85°C for 4 to 12 hours.
EFFECT: possibility of producing high-uniformity composition copolymers without toxic fractions and with molecular weight over 80 thousand, practically not containing residual monomers, and readily dissolving in ethanol.
1 cl, 4 tbl, 3 ex
SUBSTANCE: present invention relates to methods of producing fluorescent high-molecular weight compounds. Described is a method of producing a fluorescent polymer through polymerisation of a vinyl monomer in an organic solvent to form flexible polymer chains between fluorescent blocks using a fluorescent macroinitiator, in the presence of a catalyst based on a transition metal complex and an optional ligand, characterised by that said polymerisation takes place in a single step in an ether solvent based on participation therein of a fluorescent macroinitiator, which is formed during polymerisation as a result of using an initiator - p-dihalobenzene or 2,7-dihalofluorene, which contain halogens: iodine, bromine, chlorine or combination thereof, and use of said catalyst in form of a nickel complex with phosphine ligands: bis-triphenylphosphine nickel dibromide or bis-triphenylphosphine nickel dichloride combined with an activator-reducing agent - zinc dust. Described also is a method of producing a fluorescent polymer through polymerisation of a vinyl monomer in an organic solvent to form flexible polymer chains between fluorescent blocks using a fluorescent macroinitiator, in the presence of a catalyst based on a transition metal complex and an optional ligand, characterised by that said polymerisation is carried out in two steps, comprising a first step for: preliminary synthesis of a fluorescent macroinitiator by reacting p-dihalobenzene or 2,7-dihalofluorene, which contain halogens: iodine, bromine, chlorine or combination thereof, in an ether solvent in the presence of a catalyst - nickel complex with phosphine ligands: bis-triphenylphosphine nickel dibromide or bis-triphenylphosphine nickel dichloride combined with an activator-reducing agent - zinc dust, and a second step for: polymerisation of a vinyl monomer in an ether solvent in the presence of the fluorescent macroinitiator catalyst - nickel complex with phosphine ligands: bis-triphenylphosphine nickel dibromide or bis-triphenylphosphine nickel dichloride combined with an activator-reducing agent - zinc dust, obtained at the first step.
EFFECT: high technological effectiveness of producing a fluorescent polymer.
4 cl, 8 ex
SUBSTANCE: described is a method of producing acrylic resin, said method involving: polymerisation (1) of at least one non-functional acrylic monomer and (2) at least one epoxy functional acrylic monomer, having an epoxy group; and reaction of at least one amine compound, having a cyclic, heterocyclic, alkyl or heteroalkyl structure, substituted with a primary or secondary amine group, with an epoxy functional acrylic monomer such that the primary or secondary amine opens the epoxy group to obtain acrylic resin, having amine functional capabilities and hydroxyl functional capabilities, wherein the polymerisation step (1) and (2) further involves polymerisation (1) and (2) with (3) at least one functional acrylic monomer different from (2). Described also is an acrylic resin for use in compositions of a fluorocarbon coating obtained using said method. Described is a fluorocarbon coating composition containing: fluorocarbon resin, a cross-linking agent and said acrylic resin.
EFFECT: obtaining a resin which, when included in a coating composition, reduces viscosity and provides desirable pigment wetting characteristics.
30 cl, 5 ex, 2 tbl
SUBSTANCE: invention relates to methacrylic resin, an article moulded therefrom and a method of producing methacrylic resin. The methacrylic resin contains 80-99.5 wt % of a monomer link of a methacrylic ester and 0.5-20 wt % of another vinyl monomer link, which is copolymerised with at least one of the methacrylic esters, where the methacrylic resin satisfies the following conditions (I)-(III): (I) has weight-average molecular weight, measured by gel permeation chromatography, ranging from 60000 to 300000; (II) has content of a component with molecular weight of 1/5 or less of the peak molecular weight (Mp), obtained from an elution curve during gel permeation chromatography, wherein said content ranges from 7% to 40% of the degree of expansion of the area of the region obtained from the elution curve during gel permeation chromatography; and (III) has angle of repose from 20° to 40°.
EFFECT: resin is characterised by good non-colouring capacity, transparency, resistance to impact loads, resistance to solvents, while maintaining high resistance to heat ageing.
12 cl, 5 tbl, 4 dwg, 20 ex
SUBSTANCE: present invention relates to production of acrylonitrile copolymers. Described is a method for synthesis of copolymers of acrylonitrile with itaconic acid derivatives through mixing thereof in a solvent medium with addition of a radical polymerisation initiator and heating, the method characterised by that heating is carried out to temperature of 65-85°C, the solvent used is supercritical carbon dioxide, the itaconic acid derivatives used are monoesters or monoamides thereof, and content of the itaconic acid derivatives in the copolymer ranges from 0.01 to 4 mol.%. Also described is a method for synthesis of copolymers of acrylonitrile, itaconic acid derivatives and methyl acrylate through mixing thereof in a solvent medium with addition of a radical polymerisation initiator and heating, the method characterised by that heating is carried out to temperature of 65-85°C, the solvent used is supercritical carbon dioxide, the itaconic acid derivatives used are monoesters or monoamides thereof, and content of the itaconic acid derivatives in the copolymer ranges from 0.01 to 4 mol.% and content of methyl acrylate ranges from 0.01 to 4 mol.%.
EFFECT: obtaining copolymers of acrylonitrile with itaconic acid derivatives using an environmentally safe, cheap and energy-efficient method with high output.
2 cl, 1 tbl, 11 ex