期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 125, 期 -, 页码 164-177出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2018.12.011
关键词
Cross-linked polymer; Crystallization; Nucleation; Growth; Melting; Entanglements
Despite the numerous experimental investigations performed over the past century and more intensively in the last fifteen years, strain-induced crystallization in natural rubber still remains hardly understood in its precise mechanisms: a complete theoretical description for crystallization and melting of the involved crystallites is still needed to derive relevant physically-based mechanical constitutive equations. Therefore, the present Part I of our work proposes a coherent theory describing the full nucleation growth melting cycle of these crystallites, by using classical thermodynamics of phase transitions and by accounting for the topological constraints due to the network. A graphical representation of crystallite evolution involving strain, temperature, and crystallite size is then introduced, using a physical parameter to express the change of Gibbs free energy due to surface creation for a unit volume of crystalline phase. Finally, experimental results from literature exhibiting shape-memory effects in rubber are elucidated using this crystallite life cycle theory. (C) 2018 Elsevier Ltd. All rights reserved.
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