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On the stereospecificity of polymers as a function of the polymerization conditions
Abstracts
333
ON HETF_~OCHAIN P O L Y E S T E I ~ S - - X X I . M I X E D P O L Y E S T E R S ON T H E BASIS OF D 1 A TOMIC P H E N O L S
V. V. K o r s h a k , S. V. V i n o g r a d o v ~ , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 3 4 - 8 3 7 , 1957. MIxEI) polyesters of the systems; terephthalic acid-resorcinol-p,p'-dioxydiphenylpropanc, isophthalic acid-resorcinol-hydroquinone, and isophthalic acid-hydroquinone-p,p'-dioxydiphenylpropane have been synthesized and investigated. The effect of the reagent structure on the physical properties of the polyesters has been discussed. ON H E T E R O C H A I N P O L Y E S T E R S -- XXII. M I X E D P O L Y E S T E R S OF DIATOMIC P H E N O L S
S. V. V i n o g r a d o v a , V. V. K o r s h a k , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 3 9 - 8 4 1 , 1959. MIXED polyesters of the systems p,p'dioxydiphenylpropane-adipic-terephthalic acids, p,p'dioxydiphenylpropane-sebacie-terephthalie acids and hydroquinonesebacie-terephthalic acids have been synthesized. The effect of the reagent structure on the physical properties of the polyesters has been discussed. R E L A T I O N B E T W E E N M O L E C U L A R W E I G H T A N D INTRINSIC VISCOSITY OF SOLUTIONS OF POLY-p-tret-BUTYLPHENYLMETHACRYLATE FRACTIONS IN B R O M O BENZENE AND CARBON TETRACHLORIDE
O. V. K a U i s t o v , I . N . S h t e n n i k o v a , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 4 2 - 8 4 5 , 1959. A STUDY has been made of the dependence beetwen the molecular weight and the intrinsic vicosity of solutions of poly-p.tret-butylphenylmethaerylatc fractions in bromobenzene and carbon tetrachloride. Viscosity measurements of the high momcular fractions were made at different velocity gradients ~ i t h the aim or' obtaining the intrinsic wscosity at infinitely slow flow[~/Jq_~0. The moleculvr weight 2~w determined b y the method of light scattering leod to the relation for the polymer in both solvents:[ t/]q__)0= 4" 1 X ]0-4Mw0"71. ON T H E STEREOSPECIFICITY I Z A T I O N CONDITIONS
T. M. B i r s h t e i n ,
OF P O L Y M E R S AS A FUNCTION
O. B. I ) t i t s y n ,
OF T H E P O L Y M E R -
V y s o k o m o l . s o e d i n . 1: N o . 6, 8 4 6 - 8 5 1 ,
1959.
I'£ ha~ been shown t h a t interaetior' between the nearest non-adjacent I~-groups in polymer,~ of the t y p e (-CHo-CHR-)n st'ould lead to depenQence of tile probability of iso- or syndiotacbic addition of the monomer unit to the end of a growing cha,n on the t y p e of addition t.o the previous monomer unit. On this basis the fact has been explained of ~Le formation o[' stereoblock l~otyrners consistixtg of alternate iso- and syndiotactic sequences. The possibility hQ.s been examined of investigating the microtacticity of polymer chains b y their lc,ropertie.~ in solutions, which, as the authors have shown, should depend upon the stereolsomerism. I N T E R N A L R O T A T I O N A N D P H Y S I C A L P R O P E R T I E S OF P O L Y M E R CHAINS -- XVI1. CONFORMATION OF POLYisoBUTYLENE A N D P O L Y D I M E T H Y L S I L O X A N E MOLECULES IN SOLUTION
T. M. B i r s h t e i n , O. B. P t i t s y n , E . A. S o k o l o v a , V y s o k o m o l . s o e d i n , l : N o . ~. 8 5 2 - 8 5 6 , 1959. THE equations for the sizes and dipole moments of polymer chains with ~ymmetrical side groups (based, as approximation, oh independent conformation of the monomer units) have been extended to the ca.ue of alternating valency angles. The reuult obtained have been com22 Polymer '2
333
ON HETF_~OCHAIN P O L Y E S T E I ~ S - - X X I . M I X E D P O L Y E S T E R S ON T H E BASIS OF D 1 A TOMIC P H E N O L S
V. V. K o r s h a k , S. V. V i n o g r a d o v ~ , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 3 4 - 8 3 7 , 1957. MIxEI) polyesters of the systems; terephthalic acid-resorcinol-p,p'-dioxydiphenylpropanc, isophthalic acid-resorcinol-hydroquinone, and isophthalic acid-hydroquinone-p,p'-dioxydiphenylpropane have been synthesized and investigated. The effect of the reagent structure on the physical properties of the polyesters has been discussed. ON H E T E R O C H A I N P O L Y E S T E R S -- XXII. M I X E D P O L Y E S T E R S OF DIATOMIC P H E N O L S
S. V. V i n o g r a d o v a , V. V. K o r s h a k , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 3 9 - 8 4 1 , 1959. MIXED polyesters of the systems p,p'dioxydiphenylpropane-adipic-terephthalic acids, p,p'dioxydiphenylpropane-sebacie-terephthalie acids and hydroquinonesebacie-terephthalic acids have been synthesized. The effect of the reagent structure on the physical properties of the polyesters has been discussed. R E L A T I O N B E T W E E N M O L E C U L A R W E I G H T A N D INTRINSIC VISCOSITY OF SOLUTIONS OF POLY-p-tret-BUTYLPHENYLMETHACRYLATE FRACTIONS IN B R O M O BENZENE AND CARBON TETRACHLORIDE
O. V. K a U i s t o v , I . N . S h t e n n i k o v a , V y s o k o m o l . s o e d i n . 1: N o . 6, 8 4 2 - 8 4 5 , 1959. A STUDY has been made of the dependence beetwen the molecular weight and the intrinsic vicosity of solutions of poly-p.tret-butylphenylmethaerylatc fractions in bromobenzene and carbon tetrachloride. Viscosity measurements of the high momcular fractions were made at different velocity gradients ~ i t h the aim or' obtaining the intrinsic wscosity at infinitely slow flow[~/Jq_~0. The moleculvr weight 2~w determined b y the method of light scattering leod to the relation for the polymer in both solvents:[ t/]q__)0= 4" 1 X ]0-4Mw0"71. ON T H E STEREOSPECIFICITY I Z A T I O N CONDITIONS
T. M. B i r s h t e i n ,
OF P O L Y M E R S AS A FUNCTION
O. B. I ) t i t s y n ,
OF T H E P O L Y M E R -
V y s o k o m o l . s o e d i n . 1: N o . 6, 8 4 6 - 8 5 1 ,
1959.
I'£ ha~ been shown t h a t interaetior' between the nearest non-adjacent I~-groups in polymer,~ of the t y p e (-CHo-CHR-)n st'ould lead to depenQence of tile probability of iso- or syndiotacbic addition of the monomer unit to the end of a growing cha,n on the t y p e of addition t.o the previous monomer unit. On this basis the fact has been explained of ~Le formation o[' stereoblock l~otyrners consistixtg of alternate iso- and syndiotactic sequences. The possibility hQ.s been examined of investigating the microtacticity of polymer chains b y their lc,ropertie.~ in solutions, which, as the authors have shown, should depend upon the stereolsomerism. I N T E R N A L R O T A T I O N A N D P H Y S I C A L P R O P E R T I E S OF P O L Y M E R CHAINS -- XVI1. CONFORMATION OF POLYisoBUTYLENE A N D P O L Y D I M E T H Y L S I L O X A N E MOLECULES IN SOLUTION
T. M. B i r s h t e i n , O. B. P t i t s y n , E . A. S o k o l o v a , V y s o k o m o l . s o e d i n , l : N o . ~. 8 5 2 - 8 5 6 , 1959. THE equations for the sizes and dipole moments of polymer chains with ~ymmetrical side groups (based, as approximation, oh independent conformation of the monomer units) have been extended to the ca.ue of alternating valency angles. The reuult obtained have been com22 Polymer '2