Effect of amorphous microphase on structural evolution of polypropylene membrane at hot stretching

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-04-30 DOI:10.1016/j.polymertesting.2025.108827

Ming Xie , Licheng Wang , Hao Li , Liuxiang Zhan , Mingyuan Li , Zhengguo Cai , Junfen Sun , Long Chen

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Abstract

This work is aimed at researching the effect of amorphous microphase on structural evolution of polypropylene (PP) membrane at hot stretching. Herein, the functioned copolymer PPO(nPe)_0.75-(Py)_0.25 (PPOR) was synthesized to introduce the amorphous microphase, enriched region formed by physical crosslink, in PP/PPOR membrane by melt-stretching. The aggregated structure evolution led to the structure and performance modification of blending membrane. First, the amorphous microphase resulted in the amorphous thickness of the PP/PPOR film decreasing by 26.7 %. During the hot stretching process, the micropore formation was accompanied by a decrease of crystal length and an increase of amorphous orientation in the PP membrane. However, the presence of amorphous microphase reduced crystal destruction and amorphous orientation in the PP/PPOR membrane, which contributes to a greater region of micropore and a smaller pore size. Eventually, compared with pure PP membrane, the porosity of PP/PPOR membrane increased by 21.7 % at maximum and the lithium-ion conductivity of the PP/PPOR-10 membrane was enhanced by 13.0 %. This work provides a practical way from molecular design to separator design.

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非晶态微相对热拉伸聚丙烯膜结构演变的影响

本文旨在研究非晶态微相对热拉伸聚丙烯膜结构演变的影响。本文合成了功能共聚物PPO(nPe)0.75-(Py)0.25 (PPOR)，通过熔融拉伸在PP/PPOR膜中引入了物理交联形成的非晶态微相富集区。聚集结构的演变导致共混膜的结构和性能发生改变。非晶态微相的存在使PP/PPOR薄膜的非晶态厚度减少了26.7%。在热拉伸过程中，微孔的形成伴随着PP膜中晶体长度的减小和无定形取向的增加。然而，非晶微相的存在降低了PP/PPOR膜的晶体破坏和非晶取向，使得微孔面积更大，孔径更小。最终，与纯PP膜相比，PP/PPOR膜的孔隙率最大提高了21.7%，PP/PPOR-10膜的锂离子电导率提高了13.0%。这项工作为从分子设计到分离器设计提供了一条实用的途径。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.