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Synthesis and polymerization (copolymerization) of floorinated styrenes—I. Copolymerization of flourinated styrene and vinyl monomers
Abstracts
983
concentrated sulphuric acid. The polychelates are stable up to 400-450 °, possess enhanced magnetic susceptibilities, conduetivities from 10-~ to 10-12 ohm -1 . era-: and activation energies o f conductivity 10-15 kcal/mole. The infra-red spectrum shows no absorption bands in the region 700-1200 cm -1, b u t a - - C -~ N vibration peak at 2210 em -1 t h a t disappears on heating. INITIATING MECHANISM IN THE THERMAL D E G R A D A T I O N OF HIGH POLYMERS
L. A. D u d i n a a n d N . S. ¥ e n i k o l o p y a n , V y s o k o m o l . s o e d i n . 4: N o . 6, 8 6 9 - 8 7 5 , 1962. A I~I~TttOD has been proposed for determining the mechanism of active centre generation in the thermal degradation of polymers, based on determining the dependence of the effective rate constant upon the initial mean degree of polymerization. The validity of the method has been confirmed b y d a t a on the thermal degradation of polyformaldehyde. POLYMERIZATION OF ~-CHLOROCYCLOHEXENE
O. B . S M a m a t i n a 1962.
a n d P . S. S h a n t a r o v i c h , V y s o k o m o l . s o e d i n . 4: N o . 6, 876--881,
TIt~, thermal a n d catalytic polymerization of ~-chlorocyclohoxene has been investigated. I t has been found t h a t on thermal initiation the reaction obeys the monomolecular law, the activation energy being E~-52 kcal/mole. A striking feature in the polymerization of ~-chlorocyclohexene n o t observed heretofore is t h a t chain growth is accompanied b y dehydrochlorination. This complex reaction of "polymerizational condensation" leads to the formation of a " p a c k e t " structure in the polymer chain. *SYNTHESIS AND POLYMERIZATION (COPOLYMERIZATION) OF FLUORINATED STYRENES---I. COPOLYMERIZATION OF FLUORINATED STYRENE AND VINYL MONOMERS
A. F . D o k u k i n a , E . I . Y e g o r o v a , G. V. K a z e n n i k o v a , M. M. K o t o n , K . A . K o c h e s h k o v , Z. A . S m i r n o v a a n d T. V. T a l a l a y e v a , V y s o k o m o l . s o e d i n . 4: N o . 6. 8 8 2 - 8 8 8 , 1962. METHODS have been developed for the emulsion polymerization and eopolymerization of fluorinated styrenes. Copolymers o f a, fl, fl'-trifluorostyrene with styrene, 2,5-dimethylstyrene a n d m e t h y l methacrylato of o-, m- a n d p-methyl-~,~g,ff-trifluorostyrene with styrene, a n d of a,fl-difluoro-B'-chlorostyrene with styrene and 2,5-difluorostyrene have been prepared and described. CHANGE IN THE AGGREGATE STATE OF POLYMERS ON MERCURATION
V. V. K o r s h a k a n d R . N . S m i r n o v , V y s o k o m o l . s o e d i n . 4: N o . 6, 8 8 9 - 8 9 3 , 1962. TRANSITION from the amorphous to the crystalline state has been found to take place, under mereuration conditions, with polymers either possessing a chain structure or capable o f undergoing change into a chain or nearly chain structure. A schematic explanation has The Publisher will be pleased to quote for the supply o f a full English translation of a n y paper abstracted in these pages. 64 Polymer 5
983
concentrated sulphuric acid. The polychelates are stable up to 400-450 °, possess enhanced magnetic susceptibilities, conduetivities from 10-~ to 10-12 ohm -1 . era-: and activation energies o f conductivity 10-15 kcal/mole. The infra-red spectrum shows no absorption bands in the region 700-1200 cm -1, b u t a - - C -~ N vibration peak at 2210 em -1 t h a t disappears on heating. INITIATING MECHANISM IN THE THERMAL D E G R A D A T I O N OF HIGH POLYMERS
L. A. D u d i n a a n d N . S. ¥ e n i k o l o p y a n , V y s o k o m o l . s o e d i n . 4: N o . 6, 8 6 9 - 8 7 5 , 1962. A I~I~TttOD has been proposed for determining the mechanism of active centre generation in the thermal degradation of polymers, based on determining the dependence of the effective rate constant upon the initial mean degree of polymerization. The validity of the method has been confirmed b y d a t a on the thermal degradation of polyformaldehyde. POLYMERIZATION OF ~-CHLOROCYCLOHEXENE
O. B . S M a m a t i n a 1962.
a n d P . S. S h a n t a r o v i c h , V y s o k o m o l . s o e d i n . 4: N o . 6, 876--881,
TIt~, thermal a n d catalytic polymerization of ~-chlorocyclohoxene has been investigated. I t has been found t h a t on thermal initiation the reaction obeys the monomolecular law, the activation energy being E~-52 kcal/mole. A striking feature in the polymerization of ~-chlorocyclohexene n o t observed heretofore is t h a t chain growth is accompanied b y dehydrochlorination. This complex reaction of "polymerizational condensation" leads to the formation of a " p a c k e t " structure in the polymer chain. *SYNTHESIS AND POLYMERIZATION (COPOLYMERIZATION) OF FLUORINATED STYRENES---I. COPOLYMERIZATION OF FLUORINATED STYRENE AND VINYL MONOMERS
A. F . D o k u k i n a , E . I . Y e g o r o v a , G. V. K a z e n n i k o v a , M. M. K o t o n , K . A . K o c h e s h k o v , Z. A . S m i r n o v a a n d T. V. T a l a l a y e v a , V y s o k o m o l . s o e d i n . 4: N o . 6. 8 8 2 - 8 8 8 , 1962. METHODS have been developed for the emulsion polymerization and eopolymerization of fluorinated styrenes. Copolymers o f a, fl, fl'-trifluorostyrene with styrene, 2,5-dimethylstyrene a n d m e t h y l methacrylato of o-, m- a n d p-methyl-~,~g,ff-trifluorostyrene with styrene, a n d of a,fl-difluoro-B'-chlorostyrene with styrene and 2,5-difluorostyrene have been prepared and described. CHANGE IN THE AGGREGATE STATE OF POLYMERS ON MERCURATION
V. V. K o r s h a k a n d R . N . S m i r n o v , V y s o k o m o l . s o e d i n . 4: N o . 6, 8 8 9 - 8 9 3 , 1962. TRANSITION from the amorphous to the crystalline state has been found to take place, under mereuration conditions, with polymers either possessing a chain structure or capable o f undergoing change into a chain or nearly chain structure. A schematic explanation has The Publisher will be pleased to quote for the supply o f a full English translation of a n y paper abstracted in these pages. 64 Polymer 5