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β成核剂载体化对其自成纤及聚丙烯性能的影响

发表时间:2016-12-31  浏览量:1607  下载量:466
全部作者: 白文露,李怡俊,聂敏,华正坤
作者单位: 四川大学高分子研究所,高分子材料工程国家重点实验室
摘 要: 利用稀土型β成核剂(nucleating agent,NA)WBG-II及低分子量聚丙烯(polypropylene,PP)成功实现了β成核剂载体(nucleating agent carrier,NAC)化,并研究β-NAC的自组装行为及其对高分子量PP结构与性能的影响。X射线衍射(X-ray diffraction,XRD)分析、差示扫描量热(differential scanning calorimetry,DSC)分析及热台偏光显微镜(polarized optical microscope,POM)的结果表明,β-NAC在210℃即可自组装形成纤维结构,并在PP重结晶过程中诱导PP界面结晶形成β型杂化串晶,提高PP注塑样品的力学强度。通过调整NAC PP分子量及加工方式,阐明载体PP的分子量是影响NA溶解度的关键,随着载体PP分子量的降低,NA低温溶解性能提高,更易形成β型杂化串晶。
关 键 词: 高分子材料学;聚丙烯;β成核剂;自组装
Title: Effect of β-form nucleating agent carrier on its self-assembly and performance of polypropylene
Author: BAI Wenlu, LI Yijun, NIE Min, HUA Zhengkun
Organization: Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University
Abstract: In this study, a β-form nucleating agent carrier (NAC) was successfully obtained via a β-form nucleating agent (NA) WBG-II and polypropylene (PP) with a low molecular weight and its effect on the self-assembly behavior of NAC had been detailedly studied. The results obtained by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and polarized optical microscope (POM) analyses showed that it was easier and more convenient for NAC modified samples to self-assemble at relatively low processing temperature (210℃) than the conventional ones. During recrystallization, more WBG-II fibrils formed in the NAC modified samples and led an epitaxial crystallization of the PP lamellae to form β-form hybrid shish-kebabs which effectively enhanced the strength of PP. By changing the processing condition, it is demonstrated that the molecular weight of the NAC plays an essential role in the solution of NA. With decreasing molecular weight, more NAs dissolve at lower temperature and thus more β-form hybrid shish-kebabs form in the final product.
Key words: polymer materials; polypropylene; β-form nucleating agent; self-assembly
发表期数: 2016年12月第24期
引用格式: 白文露,李怡俊,聂敏,等. β成核剂载体化对其自成纤及聚丙烯性能的影响[J]. 中国科技论文在线精品论文,2016,9(24):2503-2509.
 
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