Effect of elastomer on crystalline transition and deformation behavior of isotactic polypropylene
Effect of elastomer on crystalline transition and deformation behavior of isotactic polypropylene
复制标题
弹性体对等规聚丙烯结晶转变和变形行为的影响
DOI：
10.1016/j.polymer.2013.01.012
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发表时间：
2013-02-18
期刊：
影响因子：
4.6
通讯作者：
Wang, Dujin
中科院分区：
文献类型：
--
作者：
Liu, Guoming;Zhang, Xiuqin;Wang, Dujin
通过原位同步加速器X射线散射对等规聚丙烯（iPP）及其与烯烃嵌段共聚物（OBC）共混物单轴拉伸变形过程中的结构演变进行了比较研究。小角度 X 射线散射表明，iPP/OBC 共混物中的空化发生在比纯 iPP 更小的应变下。 iPP/OBC 中空腔的重新定向发生在比 iPP 中更低的应变下。应用广角X射线散射研究晶体-中间相转变和取向过程。与纯 iPP 中的急剧转变相比，iPP/OBC 共混物中的中间相形成和取向逐渐进行。在研究的应变范围内，iPP/OBC 共混物中 iPP 基体的中间相含量和取向度远低于纯 iPP。通过结合散射结果和形态观察，提出了基于应变分布和断裂力学的变形机制。 (c) 2013 Elsevier Ltd. 保留所有权利。
The structural evolution during uniaxial tensile deformation of isotactic polypropylene (iPP) and its blend with olefin block copolymer (OBC) was comparatively investigated by in-situ synchrotron X-ray scattering. Small angle X-ray scattering showed that cavitation in iPP/OBC blend took place at a smaller strain than that in neat iPP. The reorientation of the cavities in iPP/OBC occurred at a lower strain than that in iPP as well. Wide angle X-ray scattering was applied to study the crystal-mesophase transition and the orientation process. Compared to the sharp transition in neat iPP, the mesophase formation and orientation in iPP/OBC blend proceeded gradually. The mesophase content and degree of orientation of iPP matrix in iPP/OBC blend were much lower than that in neat iPP within the investigated strain range. By the combination of scattering results and morphological observations, a deformation mechanism based on strain distribution and fracture mechanics was proposed. (c) 2013 Elsevier Ltd. All rights reserved.