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Studies in cyclic polymerization and copolymerization—VII. Synthesis and cyclic polymerization of divinylketals
Abstracts
193
ELECTRON D I F F R A C T I O N S T U D Y OF A PLASTIC SCINTILLATOR
B. V. A l e k s a n d r i y a , E . E . B a r o n i a n d R . R . S h v a n g i r a d z e , V y s o k o m o l . s o e d i n . 3: N o . 8, 1285, 1961. A~ electron diffraction study has been m a d e of the state of aggregation of the luminescent addition p - t e r p h e n y l in polystyrene scintillators (PS). I t has been shown t h a t in PS the addition is in the form of minute crystals. CONVERSIONS OF T H E R A D I C A L F O R M E D IN P O L Y F O R M A L D E H Y D E OF G A M M A R A Y I R R A D I A T I O N
A. L. Buchachenko 1961.
AS A R E S U L T
a n d M. B. N e i m a n , V y s o k o m o l . s o e d i n . 3: N o . 8, 1 2 8 5 - 1 2 8 6 ,
THE spectrum of the radical formed in the y-ray irradiation of polyformaldehyde has a duplet structure, hearing evidence of the following structure of the radical: ~ O - C h - - O ~ . SYNTHESIS A N D I N V E S T I G A T I O N OF SOME COLOURED P O L Y A M I D E S
A. N . B y k o v , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 0 7 - 1 3 1 0 , 1961. THE synthesis and properties of coloured polyamides have been described, obtained by polycondensation of prepared azobenzenedicarboxylic acids with hexamethylenediamine and of sebacic acid with coloured diamines. Polycondensation of sebacic acid with coloured aromatic diamines affords a highly coloured polyamide t h a t is practically devoid of fiber-forming properties. However, incorporation of the aromatic diamine together with a colourless f a t t y diamine during the polycondensation reaction with a dicarboxylic acid leads to increase in the melting point, enhances the fiber-forming properties and lowers the intensity of colour of the polyamide. * S T U D I E S IN CYCLIC P O L Y M E R I Z A T I O N A N D C O P O L Y M E R I Z A T I O N - - V I . SYNTHESIS A N D CYCLIC P O L Y M E R I Z A T I O N OF A R O M A T I C D I V I N Y L A C E T A L S A N D D I V I N Y L FURFURAL
S. G. M a t s o y a n a n d L . M. A k o p y a n , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 1 1 - 1 3 1 6 , 1961. SEVERAL aromatic divinylacetals and divinylfurfural have been synthesized by dehydro-
chlorination of the corresponding fl,fl'-dichlorodiethyl acetals. The ability of the above monomers to undergo cyclic polymerization has been investigated. Polymerization of aromatic divinylacetals and divinylfurfural in the presence of radical initiators has been shown to proceed according to the cyclic mechanism with the formation of the acetal derivatives of polyvinyl alcohols. The properties of the polymers have been investigated. * S T U D I E S IN CYCLIC P O L Y M E R I Z A T I O N A N D C O P O L Y M E R I Z A T I O N - - V I I . S Y N T H E S I S A N D CYCLIC P O L Y M E R I Z A T I O N OF D I V I N Y L K E T A L S
S. G. M a t s o y a n a n d A. A. S a a k y a n , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 1 7 - 1 3 2 0 , 1961. of acetone, methyl ethyl ketone and cyclohexanone have been synthesized. I t has been shown t h a t similarly to the previously described divinylacetals, polymerization of divinylketals in the presence of radical initiators proceeds b y the cyclic mechanism with the formation of acetal derivatives of polyvinyl alcohol. The properties of the polymers have been studied. DIVINYLKETALS
The Publisher will be pleased to quote for the supply of a full English translation of any papers abstracted in these pages. 13 Polymer 1
193
ELECTRON D I F F R A C T I O N S T U D Y OF A PLASTIC SCINTILLATOR
B. V. A l e k s a n d r i y a , E . E . B a r o n i a n d R . R . S h v a n g i r a d z e , V y s o k o m o l . s o e d i n . 3: N o . 8, 1285, 1961. A~ electron diffraction study has been m a d e of the state of aggregation of the luminescent addition p - t e r p h e n y l in polystyrene scintillators (PS). I t has been shown t h a t in PS the addition is in the form of minute crystals. CONVERSIONS OF T H E R A D I C A L F O R M E D IN P O L Y F O R M A L D E H Y D E OF G A M M A R A Y I R R A D I A T I O N
A. L. Buchachenko 1961.
AS A R E S U L T
a n d M. B. N e i m a n , V y s o k o m o l . s o e d i n . 3: N o . 8, 1 2 8 5 - 1 2 8 6 ,
THE spectrum of the radical formed in the y-ray irradiation of polyformaldehyde has a duplet structure, hearing evidence of the following structure of the radical: ~ O - C h - - O ~ . SYNTHESIS A N D I N V E S T I G A T I O N OF SOME COLOURED P O L Y A M I D E S
A. N . B y k o v , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 0 7 - 1 3 1 0 , 1961. THE synthesis and properties of coloured polyamides have been described, obtained by polycondensation of prepared azobenzenedicarboxylic acids with hexamethylenediamine and of sebacic acid with coloured diamines. Polycondensation of sebacic acid with coloured aromatic diamines affords a highly coloured polyamide t h a t is practically devoid of fiber-forming properties. However, incorporation of the aromatic diamine together with a colourless f a t t y diamine during the polycondensation reaction with a dicarboxylic acid leads to increase in the melting point, enhances the fiber-forming properties and lowers the intensity of colour of the polyamide. * S T U D I E S IN CYCLIC P O L Y M E R I Z A T I O N A N D C O P O L Y M E R I Z A T I O N - - V I . SYNTHESIS A N D CYCLIC P O L Y M E R I Z A T I O N OF A R O M A T I C D I V I N Y L A C E T A L S A N D D I V I N Y L FURFURAL
S. G. M a t s o y a n a n d L . M. A k o p y a n , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 1 1 - 1 3 1 6 , 1961. SEVERAL aromatic divinylacetals and divinylfurfural have been synthesized by dehydro-
chlorination of the corresponding fl,fl'-dichlorodiethyl acetals. The ability of the above monomers to undergo cyclic polymerization has been investigated. Polymerization of aromatic divinylacetals and divinylfurfural in the presence of radical initiators has been shown to proceed according to the cyclic mechanism with the formation of the acetal derivatives of polyvinyl alcohols. The properties of the polymers have been investigated. * S T U D I E S IN CYCLIC P O L Y M E R I Z A T I O N A N D C O P O L Y M E R I Z A T I O N - - V I I . S Y N T H E S I S A N D CYCLIC P O L Y M E R I Z A T I O N OF D I V I N Y L K E T A L S
S. G. M a t s o y a n a n d A. A. S a a k y a n , V y s o k o m o l . s o e d i n . 3: N o . 9, 1 3 1 7 - 1 3 2 0 , 1961. of acetone, methyl ethyl ketone and cyclohexanone have been synthesized. I t has been shown t h a t similarly to the previously described divinylacetals, polymerization of divinylketals in the presence of radical initiators proceeds b y the cyclic mechanism with the formation of acetal derivatives of polyvinyl alcohol. The properties of the polymers have been studied. DIVINYLKETALS
The Publisher will be pleased to quote for the supply of a full English translation of any papers abstracted in these pages. 13 Polymer 1