Flow-induced crystallization of polylactide stereocomplex under pressure
Flow-induced crystallization of polylactide stereocomplex under pressure
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压力下聚丙交酯立体复合物的流动诱导结晶
DOI：
10.1002/app.46378
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发表时间：
2018
影响因子：
3
通讯作者：
Li Zhong-Ming
中科院分区：
文献类型：
--
作者：
Song Ying-Nan;Zhao Qing-Xiang;Yang Shu-Gui;Ru Jia-Feng;Lin Jian-Mei;Xu Jia-Zhuang;Lei Jun;Li Zhong-Ming
在实际的聚合物加工过程中，剪切场和压力场往往同时存在，但由于实验设备的限制，它们对聚乳酸立体复合物结晶行为的影响并不明确。在此基础上，采用自制的装置，在剪切和压力共存的条件下制备样品，研究了SC的结晶行为，并采用差示扫描量热法和同步辐射技术研究了剪切流和压力对SC结晶行为的共同影响。结果表明，剪切流动有利于SC的形成。剪切流动促进了聚合物共混物的相混合，提高了SC的成核效率。压力对SC的形成有负面影响，因为自由体积的减少。对于均相聚乳酸（HC），压力对HC的形成起着积极的作用。压力抑制了SC网络的形成，从而阻碍了HC的生成。© 2018 Wiley Periodicals，Inc. J.应用聚合物Sci.2018，135，46378.
Although shear and pressure fields always coexist in practical polymer processing, their combined influence on the crystallization behavior of polylactide stereocomplex (SC) is ambiguous due to the limit of experiment device. In that case, a homemade device was employed to prepare samples under the coexistence of shear and pressure and explore the crystallization behavior of SC. Differential scanning calorimetry and synchrotron radiation were used to investigate the combined effect of shear flow and pressure on SC crystallization. The results show that shear flow was helpful for SC formation. Shear flow promoted the phase mixing of the polymer blends and improved the nucleation efficiency of SC. Pressure had a negative effect on SC formation because of the decrease in free volume. Regard to polylactide homogeneous (HC), pressure played a positive role on HC formation. Pressure suppressed the formation of SC network which could impede HC generation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2018,135, 46378.