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- Article name
- Influence of degree of crystallinity on termal and mechanical properties polymers
- Authors
- ASKADSKII A. A., , andrey@ineos.ac.ru, Nesmeyanov A. N. Institute of Organo-element Compounds of RAS, Moscow, Russia
POPOVA M. N., , popovavologda@yandex.ru, A. N. Nesmeyanov Institute of Organo-Element Compounds RAS, Moscow, Russia
MATSEEVICH T. A., , tmats@rambler.ru, Moscow State University of Civil Engineering, Moscow, Russia
PAKHNEVA O. V., , pa_ola@inbox.ru, Moscow State University of Civil Engineering, Moscow, Russia
PETUNOVA M. D., , kejmakh.margo@yandex.ru, Nesmeyanov Institute of Organoelement Compounds of RAS, Moscow, Russia
AFANASIEV E. S., , nambrot@yandex.ru, Nesmeyanov Institute of Organoelement Compounds of RAS, Moscow, Russia
KAZANTSEVA V. V., , andrey@ineos.ac.ru, Nesmeyanov Institute of Organoelement Compounds of RAS, Moscow, Russia
KORLYUKOV A. A., , alex@ineos.ac.ru, Nesmeyanov Institute of Organoelement Compounds of RAS, Moscow, Russia
KONDRASCHENKO V. I., , kondrashchenko@mail.ru, Moscow State University of Railway Engineering, Federal Agency for Railway Transport, Moscow, Russia
- Keywords
- glass transition temperature / modulus of elasticity / polyethylene of high pressure / polyethylene of low pressure / Van-der-Waals volume / degree of crystallinity / volume of crystallites
- Year
- 2015 Issue 4 Pages 51 - 61
- Code EDN
- Code DOI
- Abstract
- Influence of degree of crystallinity and crystallite size on softening point of amorphous- crystalline polymer and modulus of elasticity has been analyzed. Analysis of influence of degree of crystallinity on glass transition temperature of amorphous phase is realized on the basis of conception of L. Mandelkern that polymers crystallization reduces free volume of macromoleculs in amorphous phase and prevents their segmental motion. Analysis of equilibrium modulus in such systems is based on generalized equation of theory of rubber elasticity that takes into account van der Waals volume of cross-linked points. Crystallites are regarded as physical cross-linked points, from which linear chains located in amorphous phase go out. It was established that, modulus of elasticity depends on degree of crystallinity, crystallites size and on their concentration. Experimental analysis is produced on polyethylene, for which stress relaxation curves were measured in a wide range of temperatures. These curves are approximated by using of modern memory functions that allowed to estimate softening temperature of amorphous-crystalline material. The good agreement between experimental and calculated data was found.
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