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 minutes

To 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 minutes

The 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/h

The 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 minutes

2. 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.

 

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