Reversible Lamellar Thickening Induced by Crystal Transition in Poly(butylene succinate)
Reversible Lamellar Thickening Induced by Crystal Transition in Poly(butylene succinate)
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聚丁二酸丁二醇酯中晶体转变诱导的可逆层状增厚
DOI：
10.1021/ma300530a
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发表时间：
2012-07-10
期刊：
影响因子：
5.5
通讯作者：
Wang, Dujin
中科院分区：
文献类型：
--
作者：
Liu, Guoming;Zheng, Liuchun;Wang, Dujin
通过原位同步加速器 X 射线散射研究了聚丁二酸丁二醇酯 (PBS) 在拉伸变形过程中的结构演变。拉伸期间的晶体转变在30-90℃下进行。在α-β晶体转变期间观察到长周期的增加，这归因于非晶层厚度和结晶层厚度（层状厚度）的增加。通过“步进循环”变形测量证实了晶体转变的可逆性以及层状增厚与晶体转变的相关性。非晶层的变化是部分可恢复的，而层状厚度的变化几乎是完全可恢复的。不同晶型的晶胞沿链轴的重复长度不同，导致片层厚度的变化。结构参数的不同可恢复性可以通过非晶相和晶相的不同动力学来解释。
The structural evolution of poly(butylene succinate) (PBS) during tensile deformation was investigated by in situ synchrotron X-ray scattering. Crystal transition during stretching was identified at 30-90 degrees C. An increase of long period was observed during the alpha-beta crystal transition, which was attributed to the increase of both amorphous layer thickness and crystalline layer thickness (lamellar thickness). The reversibility of crystal transition and correlation of lamellar thickening with crystal transition were confirmed by a "step-cycle" deformation measurement. The variation of the amorphous layer was partially recoverable, while the variation of lamellar thickness was nearly fully recoverable. The different repeating length in unit cell along the chain axis in different crystal forms resulted in the variation of the lamellar thickness. The different recoverability of structural parameters was interpreted by the different dynamics of the amorphous and crystalline phase.