Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated <italic style="font-style: italic">α</italic>,<italic style="font-style: italic">ω</italic>-Diolefin

Xue-min Yin; Ya-wei Qin; Li Wang; Jian-jun Yi; Jin-yong Dong

doi:10.11777/j.issn1000-3304.2019.19213

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Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated α,ω-Diolefin

更新时间：2021-01-26

- Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated α,ω-Diolefin
- Acta Polymerica Sinica Vol. 51, Issue 6, Pages: 641-648(2020)
- 作者机构：
  
  1.中国科学院化学研究所中国科学院工程塑料重点实验室　北京 100190
  2.中国科学院大学　北京 100049
  3.中国石油天然气股份有限公司石油化工研究院　北京 102206
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19213
  CLC：
- Published：2020-6，
  
  Published Online：14 April 2020，
  
  Received：21 December 2019，
  
  Revised：29 January 2020，
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Xue-min Yin, Ya-wei Qin, Li Wang, Jian-jun Yi, Jin-yong Dong. Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated α,ω-Diolefin. [J]. Acta Polymerica Sinica 51(6):641-648(2020)
DOI：

Xue-min Yin, Ya-wei Qin, Li Wang, Jian-jun Yi, Jin-yong Dong. Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated α,ω-Diolefin. [J]. Acta Polymerica Sinica 51(6):641-648(2020) DOI： 10.11777/j.issn1000-3304.2019.19213.

摘要

基于Ziegler-Natta催化剂进行丙烯多相共聚是制备聚丙烯多相共聚物的主要方法之一，由于线性乙丙橡胶(EPR)极易发生流动会影响聚合物的颗粒形态和橡胶相的相形态，因此，本文通过在聚合中引入氯硅烷功能化非共轭

-双烯烃，使其参与乙丙无规共聚并使EPR发生同步交联，以解决上述问题. 结果显示，氯硅烷功能化非共轭

-双烯烃引入后EPR分子链之间形成交联结构，有效抑制了EPR液滴的流动和聚集，使聚合物具有良好的颗粒形态，EPR相以较小的相畴尺寸均匀地分散在PP基体中，而且硅氯基团遇水发生缩合反应可进一步提高支化/交联效率，进一步稳定聚合物的相形态，聚合物的力学性能得到较大的提升.

Abstract

Heterophasic copolymerization of propylene based on Ziegler-Natta catalyst is one of the major methods for preparing polypropylene/ethylene propylene rubber (PP/EPR) heterophasic copolymer. Compared with traditional physical blending method

PP/EPR heterophasic copolymer can achieve even dispersion of EPR phase in PP matrix with smaller phase domain size. However

for linear EPR

it is prone to flow and aggregate during polymerization

resulting in adhesion between/among polymer particles. In addition

the PP/EPR heterophasic copolymer will undergo significant phase separation during melt processing

and the EPR droplets will aggregate into larger rubber particles. Moreover

the longer the melting processing time

the more serious the phase separation of PP phase and EPR phase

and the larger the size of rubber particles. Therefore

it is very important to control the particle morphology and EPR phase morphology of propylene heterophasic copolymer. In this study

a dichlorosilane functionalized nonconjugated

-diolefin

di(5-hexenyl)dichlorosilane

was introduced into the polymerization and participated in the random copolymerization of ethylene/propylene to prompt cross-linking of EPR. The results showed that the dichlorosilane functionalized nonconjugated

-diolefin rendered the formation of cross-linked EPR

and the flow and aggregation of EPR droplets were effectively controlled. The surface morphology of PP/EPR copolymer particles was observed by SEM

which showed that all samples had good particle morphology. TEM and AFM results showed that EPR was evenly dispersed in the PP matrix with a small phase domain size. Moreover

the condensation reaction of the Si―Cl group in the presence of water further enhanced the branching/cross-linking of the copolymer

which led to a greater extent stabilized the phase morphology of the copolymer. As a result

the mechanical properties of PP/EPR copolymer were greatly improved.

关键词

Ziegler-Natta催化剂氯硅烷功能化非共轭αω-双烯烃聚丙烯多相共聚物相形态

Keywords

Ziegler-Natta catalystDi(5-hexenyl)dichlorosilanePropylene heterophasic copolymerPhase morphology

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Shaanxi Yanchang Zhongmei Yulin Energy & Chemical Company

CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Acadamy of Sciences

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University

Institute for Petrochemical Research, PetroChina Company Limited

Petrochemical Research Institute of PetroChina Co., Ltd

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Controlling Phase Morphology of EPR in Polypropylene Heterophasic Copolymer by Dichlorosilane-Functionalized Nonconjugated α,ω-Diolefin

DOI：10.11777/j.issn1000-3304.2019.19213

摘要

Abstract

关键词

Keywords

references