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Thermometry as a method of studying polymerization kinetics—I. Principles of the method and the experimental set-up
AlmtractB
583
Beginning with a certain degree of polymerization, the polymers reveal magnetic resonance signals of which the intensity corresponds to concentrations of unpaired electrons from 10IT to 10lg per g specimen, depending upon the degree of polymerization. PKEPAKATION OF GRAFT COPOLYMERS--IV. THE GRAFTING OF VINYL MONOMERS TO POLYAMIDBS
V . V. K o r s h a k , K . K . M o z g o v a a n d M. A. Shkoiin~. V y s o k o m o | . soedin, l : N o . 9, 1364-1368, 1959. FURTHER studies on the method of obtaining graft copolymers from poiykmides and vinyl monomers with the use of ozone as activator have been made. As objects of the present study served films and fibres of the polyarnides: capron, anideG~869, emmnth lind the monomers: styrene, acetat~ acrylonitrile, and methylmeth~crylate. The results of the study showed that the grafting Of vinyl monomers to the polyamides depends upon the reactivity of the initial monomer and the degree of orientation of the films and fibres of the polyamides.
POLYMERIZATION OF VINYL DERIVATIVES OF DIPHElCYL, DIPHENYLOXIDE AND DIPHENYLSULPHIDE
P. A. E l ' t s o v a , M. M. K o t o n , O. K . M i n e e v a a n d O. K . Surnina, V y s o k o m o l . soedin, l: No. 9, ]371-1373, 1959. A KINETIC study has been made of the polymerization of o.and ~.vinyldiphenyl, p.vinyl, diphenyloxide and p.vinyldiphenyisulphide. The activation energies of the compounds have been determined. The dipole moments of p-vinyldiphenylsulphide and p.vinyldiphenyloxide h~ve been measured. The thermal stability and the solubility of the polymers obtained have been determined.
AN INVF~TIGATION INTO THE DIELECTRIC LO88E8 AND ULTKASONIC WAVE A B , SORPTION IN POLYPROPYLENE
B. I. Sazhin, V. S. S k u r i k h i n a a n d Yu. A. ll'in, V y s o k o m o [ . soedin, h No. 9, 1383-1389, 1959. IN the paper the results are presented of measurement of the slope of dielectric losses at temperatures ranging from-- 100 to 150°C and frequencies 400-10 TM Hz and of the attenuation coefficient of longitudinal ultrasonic waves in propylenes of va-,Ting densities. The data show that the oblerved dielectric and mechanical relaxation losses are associated with sogement mobility in the amorphous phase of polypropylene. THERMOMETRY AS A METHOD OF STUDYING POLYMERIZATION KINETICS -- I. PRIRCIPLE$ OF THE METHOD AND THE EXPERIMENTAL SET-UP
G. V. K o r l e v , B. V. P a v l o v a n d A. A. Berlin, V y s o k o m o ] . soedin. 1: No. 9, 13961402, 1959. A DESCRIPTIO~ has been given of an experimental arrangement for thermometric measurements (including thermistor and the self-recording bridge MS-I), used for determining the rate of polymerization in the course of the reaction. 3~*
583
Beginning with a certain degree of polymerization, the polymers reveal magnetic resonance signals of which the intensity corresponds to concentrations of unpaired electrons from 10IT to 10lg per g specimen, depending upon the degree of polymerization. PKEPAKATION OF GRAFT COPOLYMERS--IV. THE GRAFTING OF VINYL MONOMERS TO POLYAMIDBS
V . V. K o r s h a k , K . K . M o z g o v a a n d M. A. Shkoiin~. V y s o k o m o | . soedin, l : N o . 9, 1364-1368, 1959. FURTHER studies on the method of obtaining graft copolymers from poiykmides and vinyl monomers with the use of ozone as activator have been made. As objects of the present study served films and fibres of the polyarnides: capron, anideG~869, emmnth lind the monomers: styrene, acetat~ acrylonitrile, and methylmeth~crylate. The results of the study showed that the grafting Of vinyl monomers to the polyamides depends upon the reactivity of the initial monomer and the degree of orientation of the films and fibres of the polyamides.
POLYMERIZATION OF VINYL DERIVATIVES OF DIPHElCYL, DIPHENYLOXIDE AND DIPHENYLSULPHIDE
P. A. E l ' t s o v a , M. M. K o t o n , O. K . M i n e e v a a n d O. K . Surnina, V y s o k o m o l . soedin, l: No. 9, ]371-1373, 1959. A KINETIC study has been made of the polymerization of o.and ~.vinyldiphenyl, p.vinyl, diphenyloxide and p.vinyldiphenyisulphide. The activation energies of the compounds have been determined. The dipole moments of p-vinyldiphenylsulphide and p.vinyldiphenyloxide h~ve been measured. The thermal stability and the solubility of the polymers obtained have been determined.
AN INVF~TIGATION INTO THE DIELECTRIC LO88E8 AND ULTKASONIC WAVE A B , SORPTION IN POLYPROPYLENE
B. I. Sazhin, V. S. S k u r i k h i n a a n d Yu. A. ll'in, V y s o k o m o [ . soedin, h No. 9, 1383-1389, 1959. IN the paper the results are presented of measurement of the slope of dielectric losses at temperatures ranging from-- 100 to 150°C and frequencies 400-10 TM Hz and of the attenuation coefficient of longitudinal ultrasonic waves in propylenes of va-,Ting densities. The data show that the oblerved dielectric and mechanical relaxation losses are associated with sogement mobility in the amorphous phase of polypropylene. THERMOMETRY AS A METHOD OF STUDYING POLYMERIZATION KINETICS -- I. PRIRCIPLE$ OF THE METHOD AND THE EXPERIMENTAL SET-UP
G. V. K o r l e v , B. V. P a v l o v a n d A. A. Berlin, V y s o k o m o ] . soedin. 1: No. 9, 13961402, 1959. A DESCRIPTIO~ has been given of an experimental arrangement for thermometric measurements (including thermistor and the self-recording bridge MS-I), used for determining the rate of polymerization in the course of the reaction. 3~*