Chain Deformation on the Formation of Shish Nuclei under Extension Flow: An in Situ SANS and SAXS Study

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• 作者：Haoran Yang ; Dong Liu ; Jianzhu Ju ; Jing Li ; Zhen Wang ; Guanyun Yan ; Youxin Ji ; Wenhua Zhang ; Guangai Sun ; Liangbin Li
• 刊名：Macromolecules
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：49
• 期：23
• 页码：9080-9088
• 全文大小：493K
• ISSN：1520-5835

文摘

By combining extensional rheological and in situ small-angle neutron and synchrotron X-ray scattering (SANS, SR-SAXS) techniques, the correlation between chain deformation and morphology of nucleus in a lightly cross-linked deuterated PE (D-PE)/hydrogenated PE (H-PE) blend has been studied at different draw ratios. The deformation of molecular chain obtained by SANS shows that shish forms at a rather small chain deformation of about 1.3, which does not support either coil–stretch transition or the simple stretch network model. Combining these data with the SAXS results, we speculate that the conformation ordering couples with density, instead of single chain conformation, is the key factor for shish formation. Meanwhile, due to the different alignment of the center of mass of the stretched network in samples with different draw ratios, a periodic concentration modulation of D-PE appears after crystallization of the samples stretched to the hardening zone, which, however, does not occur under the small draw ratio.