How temperatures affect the number of dislocations in polymer single crystals
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- 作者：Xiao Liu ; Qian-shi Wei ; Li-guo Chai…
- 关键词：Dislocation ; Spiral growth ; Single crystal ; Nucleation
- 刊名：Chinese Journal of Polymer Science
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：35
- 期：1
- 页码：78-86
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials; Condensed Matter Physics;
- 出版者：Chinese Chemical Society and Institute of Chemistry, CAS
- ISSN：1439-6203
- 卷排序：35
文摘
The influence of crystallization temperature (Tc) on the number of spiral growths on poly(butylene succinate) (PBS) single crystals, obtained by self-seeding method, was systematically studied. The studies show that the statistical average number of spiral growths formed on the PBS single crystals decays exponentially with respect to the Tc. Inspired by BCF (Bruton, Cabrera and Frank) theory and L-H (Lauritzen and Hoffman) theory, a thermodynamic model has been proposed, in which the origin of spiral growth was treated as a nucleation process. The model suggests that the nucleation rate of spiral growth depends on the inverse square of super-cooling degree, which predicted the density of spiral growth formed on lamellae, and was consistent with the experiments very well.