Shear-Induced β-Form Polypropylene in Long Chain Branching Isotactic Polypropylene

被引：18
|
作者：
Zhou, Shuai [1 ]
Wang, Weixia [1 ]
Zhao, Shicheng [1 ]
Xin, Zhong [1 ,2 ]
Shi, Yaoqi [3 ]
机构：
[1] E China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China
[2] E China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China
[3] Shanghai Res Inst Chem Ind, Shanghai Key Lab Catalysis Technol Polyolefins, Shanghai 200062, Peoples R China
来源：
POLYMER ENGINEERING AND SCIENCE | 2016年 / 56卷 / 02期
关键词：
INDUCED CRYSTALLIZATION; SUPERMOLECULAR STRUCTURE; MOLECULAR-STRUCTURE; NUCLEATING AGENT; CROSS-LINKING; FLOW; POLYMERIZATION; POLYETHYLENE; FOAMABILITY; BEHAVIOR;
D O I：
10.1002/pen.24252
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Long chain branching polypropylene (LCBPP) with different long chain branching (LCB) contents were prepared by reactive extrusion in the presence of styrene and benzoyl peroxide, and their shear-induced crystallization behaviors were investigated. The results indicated that the LCB structure extended the relaxation time of LCBPP in the molten state, which led to the formation of beta-form polypropylene under shear and high cooling rate. The content of beta-form (K-beta) increased with the increase of LCB content, shearing rate and cooling rate. The K-beta value of LCBPP3 whose weight average molecular weight was 920,000 g mol(-1) could be up to 52.0% with a shear rate of 60 s(-1) associated with a cooling rate of 280 degrees C min(-1). This study is expected not only to have a deeper understanding of the shear-induced crystallization behavior of LCBPP, but also provide a new strategy to obtain high level beta-form polypropylene. (C) 2015 Society of Plastics Engineers
引用
收藏
页码：240 / 247
页数：8
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