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Relation between the structure and dynamic properties of network elastomers over a wide range of temperatures
Abstracts
391
CHEMICAL CHANGES OF P O L Y M E R S - - V I I . R A T E OF GAS E V O L U T I O N A N D Q U A N T U M Y I E L D IN T H E PHOTOLYSIS OF P O L Y C A P R O A M I D E
S y u i T z i - p i n a n d S. R . R a f i k o v , V y s o k o m o l . s o y e d . 4: No. 10, 1 4 7 4 - 1 4 7 8 , 1962. THE kinetics of hydrogen and carbon monoxide evolution on irradiation of polycaproamide with monochromatic UV light (2537 .~) has been investigated and the q u a n t u m and radiation yields of the photolysis have been calculated. The q u a n t u m yield was found to be close to that for other classes of polymers. Close values were also obtained on utilizing the total spectrum of the lamp PRK-2. The radiation yield in the photolysis of polycaproamide is by two orders of magnitude lower than on radiolysis. SYNTHESIS A N D S T R U C T U R A L STUDY OF CATALYTIC POLY-n-BUTYLMETHA C R Y L A T E - I l L ON T H E POSSIBILITY OF E V A L U A T I N G T H E S T E R E O R E G U L A R I T Y OF T H E P O L Y M E R F R O M D E T E R M I N A T I O N S OF T H E D I E L E C T R I C A L LOSSES A N D POLARIZATION
T. A. B o r i s o v a , L. L. B u r s h t e i n a n d G. P . M i k h a i l o v , V y s o k o m o ] . s o y e d . 4: No. 10, 1 4 7 9 - 1 4 8 5 . 1962. THE temperature-frequency relation of" t a n j and e' and the dipole moments of poly-n-butylmethacrylate of syndiotactic, isotactic and atactic structure has been studied both in bulk and in solution. Measurements were made in the range of 20 Hz-150 KHz at temperatures varying from --60 to 100 °. The curves depicting this relation for the isotactic polymer differ from the corresponding curves for the atactic and syndiotactic products. The dipole moments calculated per monomer unit for the polymer in solution and in the high elastic state are higher for the isotactic specimen. The effect of the stereoregularity of the structure on the dielectric properties of" poly-n-butylmethacrylate is explained by changes in the intramolecular interactions in the polymer. * R E L A T I O N B E T W E E N T H E S T R U C T U R E A N D DYNAMIC P R O P E R T I E S OF N E T W O R K E L A S T O M E R S O V E R A W I D E R A N G E OF T E M P E R A T U R E S
Y u . V. Z e l e n e v , V y s o k o m o l . s o y e d . 4: N o . 10, 1 4 8 6 - 1 4 9 4 , 1962. A TREATMENT is presented of the results of a n investigation into the dynamic properties of network elastomers (unfilled rubbers) over a wide range of temperatures a n d at low mechanical frequencies. A comparison has been made between the experimental values of the properties and those calculated with the aid of equations derived on the basis of physically rational models of the polymer. I t has been concluded that for estimation of a n u m b e r of practically important properties of network polymers that depend u p o n their vulcanization lattice, it is convenient to make use of models with several averaged relaxation times. * H E T E R O G E N E O U S CATALYTIC P O L Y M E R I Z A T I O N OF E T H Y L E N E IN T H E P R E S E N C E OF TiCIa~AI-~AICI 3 A N D TiCIa~- ( A I ~ H C 1 )
G. A. R a z u v a y e v , K . S. M i n s k e r a n d G. T. F e d o s e y e v a , V y s o k o m o l . s o y e d . 4: N o . 10, 1 4 9 5 - 1 5 0 2 , 1962. THE polymerization of ethylene in the presence of the heterogeneous catalytic systems TiCla-~-Al-~-A1C1a and TiC1a ~-AI-[-HC1 has been investigated. Both systems m a y be used to The Publisher will be pleased to quote for the supply of a full English translation of a n y paper abstracted in these pages.
391
CHEMICAL CHANGES OF P O L Y M E R S - - V I I . R A T E OF GAS E V O L U T I O N A N D Q U A N T U M Y I E L D IN T H E PHOTOLYSIS OF P O L Y C A P R O A M I D E
S y u i T z i - p i n a n d S. R . R a f i k o v , V y s o k o m o l . s o y e d . 4: No. 10, 1 4 7 4 - 1 4 7 8 , 1962. THE kinetics of hydrogen and carbon monoxide evolution on irradiation of polycaproamide with monochromatic UV light (2537 .~) has been investigated and the q u a n t u m and radiation yields of the photolysis have been calculated. The q u a n t u m yield was found to be close to that for other classes of polymers. Close values were also obtained on utilizing the total spectrum of the lamp PRK-2. The radiation yield in the photolysis of polycaproamide is by two orders of magnitude lower than on radiolysis. SYNTHESIS A N D S T R U C T U R A L STUDY OF CATALYTIC POLY-n-BUTYLMETHA C R Y L A T E - I l L ON T H E POSSIBILITY OF E V A L U A T I N G T H E S T E R E O R E G U L A R I T Y OF T H E P O L Y M E R F R O M D E T E R M I N A T I O N S OF T H E D I E L E C T R I C A L LOSSES A N D POLARIZATION
T. A. B o r i s o v a , L. L. B u r s h t e i n a n d G. P . M i k h a i l o v , V y s o k o m o ] . s o y e d . 4: No. 10, 1 4 7 9 - 1 4 8 5 . 1962. THE temperature-frequency relation of" t a n j and e' and the dipole moments of poly-n-butylmethacrylate of syndiotactic, isotactic and atactic structure has been studied both in bulk and in solution. Measurements were made in the range of 20 Hz-150 KHz at temperatures varying from --60 to 100 °. The curves depicting this relation for the isotactic polymer differ from the corresponding curves for the atactic and syndiotactic products. The dipole moments calculated per monomer unit for the polymer in solution and in the high elastic state are higher for the isotactic specimen. The effect of the stereoregularity of the structure on the dielectric properties of" poly-n-butylmethacrylate is explained by changes in the intramolecular interactions in the polymer. * R E L A T I O N B E T W E E N T H E S T R U C T U R E A N D DYNAMIC P R O P E R T I E S OF N E T W O R K E L A S T O M E R S O V E R A W I D E R A N G E OF T E M P E R A T U R E S
Y u . V. Z e l e n e v , V y s o k o m o l . s o y e d . 4: N o . 10, 1 4 8 6 - 1 4 9 4 , 1962. A TREATMENT is presented of the results of a n investigation into the dynamic properties of network elastomers (unfilled rubbers) over a wide range of temperatures a n d at low mechanical frequencies. A comparison has been made between the experimental values of the properties and those calculated with the aid of equations derived on the basis of physically rational models of the polymer. I t has been concluded that for estimation of a n u m b e r of practically important properties of network polymers that depend u p o n their vulcanization lattice, it is convenient to make use of models with several averaged relaxation times. * H E T E R O G E N E O U S CATALYTIC P O L Y M E R I Z A T I O N OF E T H Y L E N E IN T H E P R E S E N C E OF TiCIa~AI-~AICI 3 A N D TiCIa~- ( A I ~ H C 1 )
G. A. R a z u v a y e v , K . S. M i n s k e r a n d G. T. F e d o s e y e v a , V y s o k o m o l . s o y e d . 4: N o . 10, 1 4 9 5 - 1 5 0 2 , 1962. THE polymerization of ethylene in the presence of the heterogeneous catalytic systems TiCla-~-Al-~-A1C1a and TiC1a ~-AI-[-HC1 has been investigated. Both systems m a y be used to The Publisher will be pleased to quote for the supply of a full English translation of a n y paper abstracted in these pages.