同步辐射X射线衍射原位研究 等规聚丙烯取向中间相的相转变

doi:10.3969/j.issn.0253-2778.2011.10.005

中国科学技术大学学报 ›› 2011, Vol. 41 ›› Issue (10): 872-877.DOI: 10.3969/j.issn.0253-2778.2011.10.005

同步辐射X射线衍射原位研究等规聚丙烯取向中间相的相转变

赵佰金

1.中国科学技术大学国家同步辐射实验室，安徽合肥 230029； 2.中国科学技术大学核科学技术学院，安徽合肥 230026

收稿日期:2010-10-14 修回日期:2010-12-20 出版日期:2011-10-31 发布日期:2011-10-31
通讯作者: 李良彬
作者简介:赵佰金,男,1982年生,博士. 研究方向:流动场诱导聚合物结晶. E-mail: zhaobj@mail.ustc.edu.cn
基金资助:
国家自然科学基金(20774091),中国科学院百人计划基金(018)，四川大学高分子材料重点实验室开放课题资助.

The phase transition of deformed mesophase of isotactic polypropylene by in situ synchrotron radiation WAXD studies

ZHAO Baijin

1.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; 2.School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China

Received:2010-10-14 Revised:2010-12-20 Online:2011-10-31 Published:2011-10-31

摘要/Abstract

摘要： 利用同步辐射宽角X射线衍射原位研究了淬冷得到的中间相和由其被拉伸得到的取向中间相在升温和等温退火下向晶体的转变过程.实验结果表明，虽然两者开始相转变形成晶体的温度是相同的，但发生大量相转变所需的温度，取向的中间相要明显高于淬冷直接得到的中间相，这说明前者具有更高的稳定性.通过对比两种不同中间相的初始结构，发现取向后的中间相在沿拉伸方向31螺旋结构具有更大的长程有序，从而导致了其具有更高的熔点.

关键词: 同步辐射X射线衍射, 等规聚丙烯, 取向中间相, 相转变

Abstract: The phase transition of quench-induced mesophase and deformed mesophase which was prepared by stretching the quench-induced mesophase during heating and isothermal annealing process was studied by in situ synchrotron radiation WAXD. The results show that though the temperature at which the phase transition of the two mesophase taken place is same, the temperature at which the phase transition has a slope increase is higher with deformed mesophase than quench-induced mesophase, and it indicates that the former one is much more stable. It is found that the regular conformation of 31 helices along stretching direction has a larger long-range order in deformed mesophase. That reason is used to explain why the deformed mesophase has a higher melt point.

Key words: synchrotron radiation WAXD, isotactic polypropylene, deformed mesophase, phase transition

赵佰金，马哲，洪振飞，李良彬. 同步辐射X射线衍射原位研究等规聚丙烯取向中间相的相转变[J]. 中国科学技术大学学报, 2011, 41(10): 872-877.

ZHAO Baijin, MA Zhe, HONG Zhenfei, LI Liangbin. The phase transition of deformed mesophase of isotactic polypropylene by in situ synchrotron radiation WAXD studies[J]. Journal of University of Science and Technology of China, 2011, 41(10): 872-877.

同步辐射X射线衍射原位研究等规聚丙烯取向中间相的相转变

The phase transition of deformed mesophase of isotactic polypropylene by in situ synchrotron radiation WAXD studies

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同步辐射X射线衍射原位研究 等规聚丙烯取向中间相的相转变

The phase transition of deformed mesophase of isotactic polypropylene by in situ synchrotron radiation WAXD studies

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同步辐射X射线衍射原位研究等规聚丙烯取向中间相的相转变