Simultaneous cross-linking as a way to control physical growth of random ethylene-propylene copolymer during formation of high-impact polypropylene
Simultaneous cross-linking as a way to control physical growth of random ethylene-propylene copolymer during formation of high-impact polypropylene
复制标题
同时交联是在高抗冲聚丙烯形成过程中控制无规乙烯-丙烯共聚物物理生长的一种方法
DOI：
10.1016/j.polymer.2016.01.024
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发表时间：
2016-02-24
期刊：
影响因子：
4.6
通讯作者：
Dong, Jin-Yong
中科院分区：
文献类型：
--
作者：
Shi, Jianjun;Dong, Jin-Yong
一种在高抗冲聚丙烯（hiPP）形成过程中控制无规乙烯-丙烯共聚物（EPR）物理生长的有效化学方法，即，通过促使EPR链在聚合过程中同时交联，提出了PP/EPR反应器内合金。在hiPP后期E/P共聚过程中，EPR中足够的交联度有效地阻止了其从催化剂碎片中逃逸并进入预制PP颗粒的孔网络中，从而使EPR在PP颗粒中的分散形态从具有流动性的分离液滴聚集体转变为具有稳定性的催化剂碎片粘附的离散颗粒。这项研究不仅有助于理解hiPP的颗粒生长机制，而且为继续创新和扩大工业上重要的反应器内合金技术的范围提供了一个有前途的战略。(C)2016爱思唯尔有限公司版权所有。
An effective chemistry for controlling the physical growth of random ethylene-propylene copolymer (EPR) during formation of high-impact polypropylene (hiPP), i.e., PP/EPR in-reactor alloy, is proposed, by prompting EPR chains to be simultaneously cross-linked right during its polymerization. A sufficient degree of cross-linking in EPR effectively prevents its fleeing away from the catalyst fragments and into the pore network of pre-formed PP particles during the late E/P copolymerization of hiPP process, thus transforming EPR's dispersion morphology in PP particles from segregated droplet aggregates with mobility to catalyst fragment-adhered discrete particles with stability. This research not only contributes to the understanding of particle growth mechanism of hiPP but also provides a promising strategy for continuing innovating as well as expanding the scope of the industrially important in-reactor alloy technology. (C) 2016 Elsevier Ltd. All rights reserved.