Synthesis of High-density Polyethylene-block-Isotactic Polypropylene Diblock Copolymer through Coordination Chain Transfer Polymerization

Huan Gao; Ping-jun Shao; Bang Li; Li Pan

doi:10.11777/j.issn1000-3304.2021.21125

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Synthesis of High-density Polyethylene-block-Isotactic Polypropylene Diblock Copolymer through Coordination Chain Transfer Polymerization

Articles | 更新时间：2022-07-08

- Synthesis of High-density Polyethylene-block-Isotactic Polypropylene Diblock Copolymer through Coordination Chain Transfer Polymerization
- ACTA POLYMERICA SINICA Vol. 52, Issue 11, Pages: 1498-1505(2021)
- 作者机构：
  
  1.天津大学材料科学与工程学院天津 300350
  2.中沙（天津）石化有限公司生产部天津 300271
- 作者简介：
  
  Li Pan, E-mail: lilypan@tju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2021.21125
  CLC：
- Published：20 November 2021，
  
  Published Online：18 August 2021，
  
  Received：29 April 2021，
  
  Revised：11 May 2021，
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高欢,邵平均,李邦等.配位链转移聚合合成高密度聚乙烯-嵌段-等规聚丙烯嵌段共聚物[J].高分子学报,2021,52(11):1498-1505.

Gao Huan,Shao Ping-jun,Li Bang,et al.Synthesis of High-density Polyethylene-block-Isotactic Polypropylene Diblock Copolymer through Coordination Chain Transfer Polymerization[J].ACTA POLYMERICA SINICA,2021,52(11):1498-1505.
高欢,邵平均,李邦等.配位链转移聚合合成高密度聚乙烯-嵌段-等规聚丙烯嵌段共聚物[J].高分子学报,2021,52(11):1498-1505. DOI： 10.11777/j.issn1000-3304.2021.21125.

Gao Huan,Shao Ping-jun,Li Bang,et al.Synthesis of High-density Polyethylene-block-Isotactic Polypropylene Diblock Copolymer through Coordination Chain Transfer Polymerization[J].ACTA POLYMERICA SINICA,2021,52(11):1498-1505. DOI： 10.11777/j.issn1000-3304.2021.21125.

摘要

通过利用配位链转移聚合方法，设计“一锅两步法”合成路线合成了高密度聚乙烯-嵌段-等规聚丙烯两嵌段共聚物. 双水杨醛亚胺锆催化剂/甲基铝氧烷催化体系，在二乙基锌作链转移剂的情况下，催化乙烯进行配位链转移聚合，生成双(聚乙烯基)锌并作为大分子链转移剂参与第二步由二甲基吡啶胺铪催化剂催化的丙烯等规聚合反应，最终得到高密度聚乙烯-全同聚丙烯(HDPE-

PP)嵌段共聚物. 嵌段聚合物的分子量及分布、热性能、微结构等利用高温凝胶色谱(HT-GPC)、示差扫描量热法(DSC)、高温核磁(NMR)进行了明确表征. 该类嵌段聚合物可用于增容商业料HDPE/

PP的共混物. 扫描电镜(SEM)表征结果显示，通过加入10 wt%嵌段聚合物，共混物(70/30)中分散相粒子尺寸显著减小，两相界面粘结明显改善.

Abstract

In this contribution

a “one-pot

two-step” approach was adopted to synthesize high-density polyethylene-block-isotactic polypropylene diblock copolymers

via

the coordination chain transfer polymerization. Dibenzylbis(salicylaldimine) zirconium/methylaluminoxane catalyst system could promote the coordination chain transfer polymerization of ethylene to yield bis(polyvinyl)zinc in the presence of diethyl zinc as the chain transfer agent. The bis(polyvinyl)zinc served as a chain transfer agent in the subsequent propylene polymerization

which was promoted by dimethyl[(amido)(naphthyl)pyridine] hafnium catalyst and gave a series of polyethylene-block-polypropylene copolymers. Molecular weight and molecular weight distribution

thermal properties and microstructure of the newly obtained block copolymers were clearly characterized by high temperature gel chromatography (GPC)

differential scanning calorimetry (DSC)

high temperature nuclear magnetic (NMR)

etc

. Finally

the diblock copolymers (10 wt%‍) was also blended with commercially available PE and

PP (70/30) to improve their compatibility. As SEM analysis revealed

dispersed phase particle size was significantly reduced upon the addition of the block polymer

and the interfacial bonding of the two phases could be obviously improved. This research not only provides new polymerization method for the synthesis of block copolymer

but also affords good PE/PP compatibilizers. The newly resultant PE-

PP block copolymers are expected to play a promising role in the recycling of the waste PE and PP plastic and the sustainable development.

关键词

配位链转移聚合双(聚乙烯基)锌嵌段共聚物增容剂

Keywords

Coordination chain transfer polymerizationBis(polyvinyl)zincBlock copolymerCompatibilizer

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