期刊
POLYMER
卷 42, 期 23, 页码 9611-9615出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(01)00511-0
关键词
chromium catalyst; copolymerisation; ethylene propylene random copolymer
Novel ethylene-propylene random copolymers with isotactic sequence of propylene were synthesized with a MgCl2-supported Cr(acac)(3) catalyst. The propylene content was controlled by the monomer concentration. The crystallinity of these copolymers showed a minimum around 50 mol% content of propylene, or ethylene. According to differential scanning calorimetry and wide-angle X-ray diffraction, crystals of polyethylene (PE) and polypropylene (PP) do not coexist, and ethylene-rich copolymers exhibit the orthorhombic form of PE and propylene-rich copolymers exhibit the monoclinic form of PP. It was found that the mechanical properties of these changed drastically between 70 and 53 mol% of propylene content. (C) 2001 Elsevier Science Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据