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Mechanism of kinetic chain termination in the radical polymerization of vinyl chloride with participation of 14C-labelled initiators
204
Abstracts
CHELATE POLYMERS OF URANIL
V. V. Z e l e n t s o v , B a i V a n - m i n , I. A. S a v i c h a n d V. I. S p i t s y n , V y s o k o m o l . s o e d i n . 3: N o . 10, 1 5 3 5 - 1 5 4 3 , 1961. Six polymeric Schiff's bases from 3,3-methylene-bis-5-bromo-2-hydroxybenzaldehyde, 3,3-methylene-bis-5-chloro-2-hydroxybenzaldehyde and ethylenediamine as well as o-and p-phenylenediaznine have been synthesized for the first time and on their basis six chelate polymers of uranil have been prepared and some of their properties have been described. The compounds are characterized by comparatively high decomposition temperatures (from 270 to 300°), b y a deep colour and b y poor solubility in ordinary organic solvents. They possess low densities and are paramagnetic with varying specific magnetic susceptibilities. The procedure for the synthesis of such chelate polymers is very simple and allows for the preparation of numerous derivatives of these compounds. CHEMICAL CONVERSION OF POLYSTYRENE
E . V. K u z n e t s o v , I . P . P r o k h o r o v a N o . 10, 1 5 4 4 - 1 5 4 8 , 1961.
a n d D. A. F a i z u l l i n a , V y s o k o m o l . s o e d i n . 3:
NEW high molecular compounds have been obtained b y reaction of benzoyl, p-chlorobenzoyl, o.chlorobonzoyl and cinnamyl chlorides and of phthalie anhydride with polystyrene, and their properties have been described. The products have been found to undergo changes in solubility under the influence of light. The light susceptibility of the polymeric analogs of polystyrene increases with increase in molecular weight of the aromatic radical. W i t h increase in the number of aromatic rings in the polymers obtained their softening temperature increases. *MECHANISM OF KINETIC CHAIN TERMINATION IN THE RADICAL POLYMERIZATION OF VINYL CHLORIDE WITH PARTICIPATION OF 14C-LABELLED INITIATORS
G. A . R a z u v a e v , G. G. P e t u k h o v 1 5 4 9 - 1 5 5 3 , 1961.
a n d V. A . D o d o n o v , V y s o k o m o 1 . s o e d i n . 3:
THE tracer method was used to investigate the chain termination reaction in the polymerization of vinyl chloride. The existence of a chain transfer reaction m a y be ascertained from determination of the number of initiator fragments incorporated in the polymer molecules. The block and suspension polymerization of vinyl chloride has been investigated in the presence of azoisobutyronitrile labelled with 14C in the nitrile group and of benzoyl peroxide labelled with 14C in the carboxyl group. The number of end groups per polymer molecule has been found to be 0.19-0.40. This shows t h a t chain transfer occurs and t h a t the number of initiator fragments practically does not change with growth in molecular weight. I t thus follows t h a t the size of the molecular chain is determined chiefly b y the chain transfer reaction. The length of the kinetic chain determined from the number of end groups is 2-4 times larger than the molecular chain length. *POLYMERIZATION OF MIXED CYCLOTETRASILOXANES
K. A. Andrianov 1560, 1961.
a n d S. E . Y a k u s h k i n a ,
V y s o k o m o l . s o e d i n . 3: N o . 10, 1 5 5 4 -
THE catalytic polymerization has been investigated of bis-hexamethyldiphonyleyelotetrasiloxane oxide, heptamethyl(trimethylsiloxy)cyclotetrasiloxane, heptamethylchlorophenyleyclotetrasiloxane and octamethylcyclotetrasfloxane in the presence of sulphuric acid a n d bis-
Abstracts
CHELATE POLYMERS OF URANIL
V. V. Z e l e n t s o v , B a i V a n - m i n , I. A. S a v i c h a n d V. I. S p i t s y n , V y s o k o m o l . s o e d i n . 3: N o . 10, 1 5 3 5 - 1 5 4 3 , 1961. Six polymeric Schiff's bases from 3,3-methylene-bis-5-bromo-2-hydroxybenzaldehyde, 3,3-methylene-bis-5-chloro-2-hydroxybenzaldehyde and ethylenediamine as well as o-and p-phenylenediaznine have been synthesized for the first time and on their basis six chelate polymers of uranil have been prepared and some of their properties have been described. The compounds are characterized by comparatively high decomposition temperatures (from 270 to 300°), b y a deep colour and b y poor solubility in ordinary organic solvents. They possess low densities and are paramagnetic with varying specific magnetic susceptibilities. The procedure for the synthesis of such chelate polymers is very simple and allows for the preparation of numerous derivatives of these compounds. CHEMICAL CONVERSION OF POLYSTYRENE
E . V. K u z n e t s o v , I . P . P r o k h o r o v a N o . 10, 1 5 4 4 - 1 5 4 8 , 1961.
a n d D. A. F a i z u l l i n a , V y s o k o m o l . s o e d i n . 3:
NEW high molecular compounds have been obtained b y reaction of benzoyl, p-chlorobenzoyl, o.chlorobonzoyl and cinnamyl chlorides and of phthalie anhydride with polystyrene, and their properties have been described. The products have been found to undergo changes in solubility under the influence of light. The light susceptibility of the polymeric analogs of polystyrene increases with increase in molecular weight of the aromatic radical. W i t h increase in the number of aromatic rings in the polymers obtained their softening temperature increases. *MECHANISM OF KINETIC CHAIN TERMINATION IN THE RADICAL POLYMERIZATION OF VINYL CHLORIDE WITH PARTICIPATION OF 14C-LABELLED INITIATORS
G. A . R a z u v a e v , G. G. P e t u k h o v 1 5 4 9 - 1 5 5 3 , 1961.
a n d V. A . D o d o n o v , V y s o k o m o 1 . s o e d i n . 3:
THE tracer method was used to investigate the chain termination reaction in the polymerization of vinyl chloride. The existence of a chain transfer reaction m a y be ascertained from determination of the number of initiator fragments incorporated in the polymer molecules. The block and suspension polymerization of vinyl chloride has been investigated in the presence of azoisobutyronitrile labelled with 14C in the nitrile group and of benzoyl peroxide labelled with 14C in the carboxyl group. The number of end groups per polymer molecule has been found to be 0.19-0.40. This shows t h a t chain transfer occurs and t h a t the number of initiator fragments practically does not change with growth in molecular weight. I t thus follows t h a t the size of the molecular chain is determined chiefly b y the chain transfer reaction. The length of the kinetic chain determined from the number of end groups is 2-4 times larger than the molecular chain length. *POLYMERIZATION OF MIXED CYCLOTETRASILOXANES
K. A. Andrianov 1560, 1961.
a n d S. E . Y a k u s h k i n a ,
V y s o k o m o l . s o e d i n . 3: N o . 10, 1 5 5 4 -
THE catalytic polymerization has been investigated of bis-hexamethyldiphonyleyelotetrasiloxane oxide, heptamethyl(trimethylsiloxy)cyclotetrasiloxane, heptamethylchlorophenyleyclotetrasiloxane and octamethylcyclotetrasfloxane in the presence of sulphuric acid a n d bis-