Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated <italic style="font-style: italic">α</italic>,<italic style="font-style: italic">ω</italic>-Diolefin

Yang Liu; Ya-wei Qin; Li Wang; Jian-jun Yi; Jin-yong Dong

doi:10.11777/j.issn1000-3304.2020.20029

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Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated α,ω-Diolefin

更新时间：2021-01-26

- Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated α,ω-Diolefin
- Acta Polymerica Sinica Vol. 51, Issue 9, Pages: 1050-1058(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.issn1000-3304.2020.20029
  CLC：
- Published：15 August 2020，
  
  Published Online：22 May 2020，
  
  Received：12 February 2020，
  
  Revised：3 April 2020，
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Yang Liu, Ya-wei Qin, Li Wang, Jian-jun Yi, Jin-yong Dong. Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated α,ω-Diolefin. [J]. Acta Polymerica Sinica 51(9):1050-1058(2020)
DOI：

Yang Liu, Ya-wei Qin, Li Wang, Jian-jun Yi, Jin-yong Dong. Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated α,ω-Diolefin. [J]. Acta Polymerica Sinica 51(9):1050-1058(2020) DOI： 10.11777/j.issn1000-3304.2020.20029.

摘要

通过乙丙共聚物的原位交联，可以降低其分子链运动性，从而在丙烯多相共聚过程中，实现对合金相形貌的控制. 但在Ziegler-Natta催化剂体系中，长碳链的非共轭

-双烯烃在促进交联的同时，伴随着悬垂双键结构的形成，其对原位交联效果的影响尚不清楚. 本文选用9

9-二(甲氧基甲基)芴为内给电子体的MgCl

/TiCl

催化剂，1

9-癸二烯为交联剂，合成了系列乙丙共聚物，通过对链结构和流动性的分析发现，交联结构的形成明显滞后于悬垂双键，且乙丙共聚物流动性随1

9-癸二烯浓度增加呈现不规则的U型变化：当1

9-癸二烯浓度小于0.22 mol/L时，乙丙共聚物流动性增强；当浓度高于0.22 mol/L时，流动性受限. 本研究对以非共轭

-双烯烃控制丙烯多相共聚反应和新型聚丙烯反应器合金的合成有一定指导作用.

Abstract

In heterophasic copolymerization of propylene to high-impact PP copolymer

an emerging approach to control of the all-important copolymer particle morphology is

in situ

crosslinking the ethylene-propylene copolymer (EPR) by nonconjugated

-diolefin. With the formation of crosslinking structure

pendant unsaturation structure supervened and its role was unveiled. This paper discusses the effect of pendant unsaturation structure on EPR’s flowability. A series of EPR samples with increasing crosslinking degrees were synthesized by an MgCl

9-bis (methoxymethyl) fluorene/TiCl

catalyst and 1

9-decadiene of increasing concentrations. The copolymers were characterized by NMR

GPC

and DSC for chain structure

small amplitude oscillatory shear for linear viscoelasticity

and creep rheology for flowability. Increasing 1

9-decadiene concentration increased the EPR crosslinking degree monotonously; nevertheless

its effect on viscoelasticity was rather complex. Chain structure analyses reveal that in terms of effect on viscoelasticity

two opposite reaction processes are in progress in ethylene/propylene copolymerizaiton with

in situ

crosslinking by 1

9-decadiene

one being crosslinking itself

the other the accompanying fomation of pendant

-olefin unsaturations which are short chain-branching in essence. It is perceived that the sluggishness of Ziegler-Natta catalyst to sterically bulky

-olefin makes the progression of crosslinking lag behind that of short chain-branching

which accounts for the peculiar U-shape in EPR flowability and 1

9-decadiene concentration relation.

关键词

非共轭αω-双烯烃乙丙共聚原位交联Ziegler-Natta催化剂流动性

Keywords

Nonconjugated αω-diolefinEthylene-propylene copolymerizationin situ crosslinkingZiegler-Natta catalystFlowability

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

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

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

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Flowability of Ethylene-Propylene Copolymer in Situ-regulated by Long-chain Nonconjugated α,ω-Diolefin

DOI：10.11777/j.issn1000-3304.2020.20029

摘要

Abstract

关键词

Keywords

references