Synergistically Enhance Toughness and Electrical Breakdown Resistance of Polypropylene by <italic style="font-style: italic">β</italic>-Crystal Modification

Jia-hao Shen; Rui-miao Liang; Lan Jia; Wen-wen Yu; Qiang Zheng

doi:10.11777/j.issn1000-3304.2025.25166

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Synergistically Enhance Toughness and Electrical Breakdown Resistance of Polypropylene by β-Crystal Modification

Research Article | 更新时间：2026-02-01

- Synergistically Enhance Toughness and Electrical Breakdown Resistance of Polypropylene by β-Crystal Modification
- Acta Polymerica Sinica Vol. 57, Issue 2, Pages: 595-607(2026)
- 作者机构：
  
  1.太原理工大学材料科学与工程学院太原 030024
  2.浙江大学高分子科学与工程学系杭州 310027
- 作者简介：
  
  Lan Jia, E-mail: jialan@tyut.edu.cn
  Wen-wen Yu, E-mail: yuwenwen@tyut.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25166
  CLC：
- CSTR：32057.14.GFZXB.2025.7466
- Received：10 July 2025，
  
  Accepted：22 September 2025，
  
  Published Online：12 December 2025，
  
  Published：20 February 2026
- 稿件说明：
移动端阅览
沈佳豪, 梁锐淼, 贾兰, 余雯雯, 郑强. 基于β晶型调控协同提升聚丙烯的韧性与耐电击穿性能. 高分子学报, 2026, 57(2), 595-607.

Shen, J. H.; Liang, R. M.; Jia, L.; Yu, W. W.; Zheng, Q. Synergistically enhance toughness and electrical breakdown resistance of polypropylene by β-crystal modification. Acta Polymerica Sinica (in Chinese), 2026, 57(2), 595-607.
沈佳豪, 梁锐淼, 贾兰, 余雯雯, 郑强. 基于β晶型调控协同提升聚丙烯的韧性与耐电击穿性能. 高分子学报, 2026, 57(2), 595-607. DOI： 10.11777/j.issn1000-3304.2025.25166. CSTR： 32057.14.GFZXB.2025.7466.

Shen, J. H.; Liang, R. M.; Jia, L.; Yu, W. W.; Zheng, Q. Synergistically enhance toughness and electrical breakdown resistance of polypropylene by β-crystal modification. Acta Polymerica Sinica (in Chinese), 2026, 57(2), 595-607. DOI： 10.11777/j.issn1000-3304.2025.25166. CSTR： 32057.14.GFZXB.2025.7466.

摘要

传统聚丙烯增韧通常采用引入弹性体增韧剂的方法，难以协同优化强度-韧性-电性能. 针对这一问题，本研究提出一种非添加型策略，通过熔融共混无规共聚聚丙烯(PPR)、等规聚丙烯(

PP)与成核剂，利用

PP与成核剂协同诱导PPR生成高

晶含量结晶相(

晶相对含量为42%). 经等温后处理

晶含量进一步提高到48%，并形成了多重晶界结构. 这种多重晶界结构通过抑制机械裂纹与导电裂纹的萌生，并增加界面极化作用，实现了强度-韧性-电性能三者的平衡优化. 在强度保持的同时，韧性达33.6 kJ/m

，击穿强度达455 kV/mm，介电常数提高至2.11. 其中，击穿强度与韧性的1/4次方成正比，符合Fothergill机械-电击穿理论. 此外，相较于常规橡胶增韧体系，该材料表现出更优异的耐机械损伤能力，经反复机械损伤后击穿强度仍超过300 kV/mm. 本研究为同时兼具高电性能与力学性能材料的设计与制备提供了新思路.

Abstract

Traditional polypropylene toughening typically employs elastomeric toughening agents

which often compromises the synergistic optimization of strength

toughness

and electrical properties. To address this issue

this study adopted a non-additive strategy involving the melt blending of polypropylene random copolymer (PPR)

isotactic polypropylene (

PP)

and a

-nucleating agent. This approach leveraged the synergistic effect of

PP and the nucleating agent to induce the formation of a highly

-crystalline phase (achieving 42%

-crystal content). Subsequent isothermal post-treatment further increased the

-crystal content to 48% and established a multiple boundary structure. This multigrain boundary structure optimized material performance by suppressing the initiation of both mechanical and electrical cracks while enhancing interfacial polarization. Consequently

the material maintained its strength while achieving a toughness of 33.6 kJ/m

a breakdown strength of 455 kV/mm

and increased dielectric constant of 2.11

thereby achieving a balanced optimization of strength

toughness

and electrical properties. Furthermore

compared to conventional rubber-toughened systems

this material exhibited superior mechanical damage resistance

taining a breakdown strength exceeding 300 kV/mm after repeated mechanical damage. This work provides novel insights for designing and fabricating materials that simultaneously possess high electrical and mechanical performance.

关键词

Keywords

references

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Synergistically Enhance Toughness and Electrical Breakdown Resistance of Polypropylene by β-Crystal Modification

DOI：10.11777/j.issn1000-3304.2025.25166

摘要

Abstract

关键词

Keywords

references