Synthesis, Structure and Properties of Polypropylene/Poly(1-butene) In-Reactor Alloys

被引：0
|
作者：
Du D. [1 ]
Gao Y. [1 ]
Zheng W. [1 ]
Shao H. [1 ]
He A. [1 ]
机构：
[1] Shandong Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Ministry of Rubber and Plastic Materials and Engineering Education, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2021年 / 37卷 / 06期
关键词：
In-reactor alloys; Mechanical properties; Microstructure structure; Poly(1-butene); Polypropylene;
D O I：
10.16865/j.cnki.1000-7555.2021.0157
中图分类号：
学科分类号：
摘要：
High isotactic polypropylene (iPP)/high isotactic poly(1-butene) (iPB) in-reactor alloys were prepared using TiCl4/MgCl2 with internal electron donor by two-stage polymerization process, in which the second stage 1-butene polymerizations were performed on the active polypropylene particles formed in the first stage polymerization of propylene monomer. The solvent extraction fractionation method was used to divide iPP/iPB alloys into three fractions: ether soluble fraction, n-heptane soluble fraction and n-heptane insoluble fraction. The microstructure structure of alloys and their fractions were characterized by Fourier transform infrared spectroscopy, 13C magnetic resonance and gel permeation chromatography. The content of iPP in iPP/iPB alloys could be adjusted from 18% to 76% by changing the polymerization conditions, such as the first stage propylene polymerization time. When the propylene polymerization time is short, iPP/catalyst particles break and release a large number of active centers, which makes the catalytic efficiency of the alloy system increase. With the increasing of polymerization time, the catalytic efficiency decreases due to the "embedding" effect of some active centers. With the increasing of iPP content in alloys, the crystallinity of iPP phase is increased, while the crystallinity of iPB phase is decreased. Under suitable polymerization conditions, not only the polymerization efficiency is improved greatly, but also the alloy (iPP mass fraction of 37.8%) has excellent mechanical properties: the tensile strength reach to 35.3 MPa and impact strength is 46.8 kJ/m2 with the best comprehensive mechanical performance. © 2021, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：27 / 33
页数：6
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