Rheology Study on Polypropylene Blends with <italic style="font-style: italic">in situ</italic> Core-Shell Dispersed Particles

Ming-zhao Li; Liang-hai Zhu; Feng Chen; Qiang Wu; Yong-gang Shangguan; Qiang Zheng

doi:10.11777/j.issn1000-3304.2022.22107

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Rheology Study on Polypropylene Blends with in situ Core-Shell Dispersed Particles

Research Article | 更新时间：2024-10-08

- Rheology Study on Polypropylene Blends with in situ Core-Shell Dispersed Particles
- ACTA POLYMERICA SINICA Vol. 53, Issue 11, Pages: 1399-1408(2022)
- 作者机构：
  
  1.高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程系杭州 310027
  2.浙江大学高分子新物质创制国际研究中心海宁 314400
  3.浙江农林大学化学与材料工程学院杭州 311300
- 作者简介：
  
  Feng Chen, E-mail: juhuatai@zju.edu.cn
  Yong-gang Shangguan, E-mail: shangguan@zju.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22107
  CLC：
- Published：20 November 2022，
  
  Published Online：29 August 2022，
  
  Received：01 April 2022，
  
  Accepted：30 May 2022
- 稿件说明：
移动端阅览
李明钊,祝良海,陈锋等.含原位聚合物核壳粒子聚丙烯共混物的流变学研究[J].高分子学报,2022,53(11):1399-1408.

Li Ming-zhao,Zhu Liang-hai,Chen Feng,et al.Rheology Study on Polypropylene Blends with in situ Core-Shell Dispersed Particles[J].ACTA POLYMERICA SINICA,2022,53(11):1399-1408.
李明钊,祝良海,陈锋等.含原位聚合物核壳粒子聚丙烯共混物的流变学研究[J].高分子学报,2022,53(11):1399-1408. DOI： 10.11777/j.issn1000-3304.2022.22107.

Li Ming-zhao,Zhu Liang-hai,Chen Feng,et al.Rheology Study on Polypropylene Blends with in situ Core-Shell Dispersed Particles[J].ACTA POLYMERICA SINICA,2022,53(11):1399-1408. DOI： 10.11777/j.issn1000-3304.2022.22107.

摘要

制备了含原位聚合物核壳粒子的聚丙烯/乙丙橡胶/高密度聚乙烯(PP/EPR/HDPE)共混物，并通过动态流变方法对其熔体结构稳定性进行了研究. 动态时间扫描结果表明，PP/EPR/HDPE共混物具有较好的热稳定性. 动态频率扫描结果表明，当EPR含量较低时，共混物中聚合物核壳粒子分散相的存在导致体系的长时松弛行为更加显著. 当熔体结构在大应变下遭到破坏后，含核壳粒子分散相的共混物具有比普通PP/EPR共混物更快的结构回复速率，且结构回复速率随着核壳粒子的尺寸增大而加快. 通过增大普通PP/EPR体系的EPR含量使其橡胶粒子尺寸与三元共混物中原位聚合物核壳粒子尺寸接近时，两者呈现类似的流变行为，这表明PP/EPR/HDPE体系的熔体结构稳定性源于核壳粒子结构导致的分散相尺寸增大的作用.

Abstract

Polypropylene/ethylene-propylene random copolymer/high density polyethylene (PP/EPR/HDPE) blends with core-shell particles were prepared by melting mixing to study the effects of core-shell particles on rheological behaviors of PP based system. Morphology observation through SEM confirmed the core-shell structure of dispersed particles. Different rheological behaviors were studied by rheometer through dynamic test

stress relaxation test

cycled strain sweep test and modulus recovery test. Results showed PP system with core-shell particles presented obvious long-time relaxation

which was not observed in PP/EPR binary blend with low EPR content. It was believed the obvious long-time relaxation came from interfacial relaxation of dispersed phase with larger size

leading to a relaxation plateau. While for PP/EPR binary blend with low EPR content

relaxation modulus showed a quick drop. The different relaxation behaviors between above samples indicated that the introduction of HDPE in PP/EPR system could enlarge the size of dispersed phase through formation of core-shell particles. Cycled strain sweep test proved that PP/EPR/HDPE had satisfactory structure stability after loading large strain

meaning that materials performance could quickly recover once the external strain was unloaded. It was believed that long-time relaxation and structure stability of PP/EPR/HDPE both resulted from larger dispersed phase. This study proved again that HDPE could work as equivalent rubber in PP system by formation of core-shell particles.

关键词

聚合物核壳粒子聚丙烯共混物流变行为

Keywords

Polymeric core-shell particlePolypropylene blendRheological behavior

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Rheology Study on Polypropylene Blends with in situ Core-Shell Dispersed Particles

DOI：10.11777/j.issn1000-3304.2022.22107

摘要

Abstract

关键词

Keywords

references