Synthesis, Structures and Properties of Long-chain-branched Polyolefin Elastomers

Ming Liu; Xiao-jun Yang; Feng-tao Chen; Jin-yong Dong

doi:10.11777/j.issn1000-3304.2025.25053

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Synthesis, Structures and Properties of Long-chain-branched Polyolefin Elastomers

Research Article | 更新时间：2025-08-28

- Synthesis, Structures and Properties of Long-chain-branched Polyolefin Elastomers
- Acta Polymerica Sinica Vol. 56, Issue 9, Pages: 1480-1492(2025)
- 作者机构：
  
  1.武汉工程大学化工与制药学院绿色化工过程教育部重点实验室武汉 430205
  2.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
  3.中国科学院大学北京 100049
- 作者简介：
  
  Xiao-jun Yang, E-mail: yangxiaojun@wit.edu.cn
  Feng-tao Chen, E-mail: chenfengtao@iccas.ac.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25053
  CLC：
- CSTR：32057.14.GFZXB.2025.7395
- Received：28 February 2025，
  
  Accepted：03 April 2025，
  
  Published Online：11 June 2025，
  
  Published：20 September 2025
- 稿件说明：
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刘明, 杨小俊, 陈风涛, 董金勇. 长链支化聚烯烃弹性体的合成、结构与性能研究. 高分子学报, 2025, 56(9), 1480-1492

Liu, M.; Yang, X. J.; Chen, F. T.; Dong, J. Y. Synthesis, structures and properties of long-chain-branched polyolefin elastomers. Acta Polymerica Sinica, 2025, 56(9), 1480-1492
刘明, 杨小俊, 陈风涛, 董金勇. 长链支化聚烯烃弹性体的合成、结构与性能研究. 高分子学报, 2025, 56(9), 1480-1492 DOI： 10.11777/j.issn1000-3304.2025.25053. CSTR： 32057.14.GFZXB.2025.7395.

Liu, M.; Yang, X. J.; Chen, F. T.; Dong, J. Y. Synthesis, structures and properties of long-chain-branched polyolefin elastomers. Acta Polymerica Sinica, 2025, 56(9), 1480-1492 DOI： 10.11777/j.issn1000-3304.2025.25053. CSTR： 32057.14.GFZXB.2025.7395.

摘要

聚烯烃弹性体(POE)作为高端的聚乙烯树脂，具有高抗冲击性、高弹性、高柔韧性以及与其他聚烯烃材料的优异相容性，但由于其本身缺乏长链支化结构，导致其在熔体加工过程中仍存在不足. 本研究采用两种策略，分别将

-烯烃基甲基二氯硅烷和非共轭

-双烯烃作为长链支化功能助剂，向POE分子链中引入H型长链支化结构，合成得到了同时具备高熔体强度、高透光率和优良力学性能的新型长链支化聚烯烃弹性体(LCB-POE). POE样品的傅里叶红外光谱(FITR)、凝胶渗透色谱(GPC)和熔体流变测试结果均证明了长链支化结构的存在. 对比两组样品的流变测试结果可知，使用

-烯烃基甲基二氯硅烷作为LCB助剂具有更高的长链支化结构生成效率.

Abstract

As a premium polyethylene resin

polyolefin elastomer (POE) demonstrates extensive applications in automotive components

photovoltaic encapsulation films

and wire/cable insulation systems owing to its remarkable impact resistance

superior elasticity

exceptional flexibility

and outstanding compatibility with other polyolefin materials. However

its inherent deficiency in long-chain-branching (LCB) structures results in multiple processing limitations during melt processing

significantly constraining broader industrial implementation. In this study

two strategies were adopted to introduce H-shape LCB structures into the POE molecular chain by employing

-alkenylmethyldichlorosilane (hex-DCS) and nonconjugated

-diolefin (1

9-DD) as LCB functional additives

respectively. A new type of long-chain-branching polyolefin elastomer (LCB-POE) with both high melt strength

high light transmittance

and significantly enhanced mechanical properties was synthesized. Comprehensive characterization including Fourier transform infrared spectroscopy (FTIR)

gel permeation chromatography (GPC)

and melt rheological analysis conclusively demonstrated the successful incorporation of LCB structures

with the degree of LCB increasing proportionally to the concentration of LCB agents. Comparative rheological analysis revealed distinct structural evolution

pathways: non-conjugated

-diolefins as LCB agents initially induced pendant short-chain branches on POE backbones at low concentrations

failing to transition into LCB architectures. In contrast

-alkenylmethyldichlorosilane exhibited superior LCB formation efficiency

achieving effective long-chain branching at equivalent low loading levels through optimized topological connectivity.

关键词

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