膨体聚四氟乙烯薄膜制备过程中的拉伸形变机理及纵向拉伸比的选择

王岩旭; 陈洋; 王丽; 王柯; 傅强

doi:10.11777/j.issn1000-3304.2025.25011

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膨体聚四氟乙烯薄膜制备过程中的拉伸形变机理及纵向拉伸比的选择

研究论文 | 更新时间：2025-03-31

- 膨体聚四氟乙烯薄膜制备过程中的拉伸形变机理及纵向拉伸比的选择
- Deformation Mechanism and Selection of Longitudinal Stretching Ratio in the Preparation Process of Expanded Polytetrafluoroethylene Film
- 高分子学报 2025年页码：1-12
- 作者机构：
  
  1.四川大学高分子科学与工程学院高分子材料工程国家重点实验室成都 610065
  2.山东东岳未来氢能材料股份有限公司淄博 255100
- 作者简介：
  
  E-mail: qiangfu@scu.edu.cn
- 基金信息：
  
  山东省重点研发计划(重大科技创新工程)(2022CXG010306)
- DOI：10.11777/j.issn1000-3304.2025.25011
  中图分类号：
- CSTR：32057.14.GFZXB.2025.7355
- 收稿日期：2025-01-07，
  
  录用日期：2025-02-06，
  
  网络出版日期：2025-03-31，
- 稿件说明：
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王岩旭, 陈洋, 王丽, 王柯, 傅强. 膨体聚四氟乙烯薄膜制备过程中的拉伸形变机理及纵向拉伸比的选择. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25011

Wang, Y. X.; Chen, Y.; Wang, L.; Wang, K.; Fu, Q. Deformation mechanism and selection of longitudinal stretching ratio in the preparation process of expanded polytetrafluoroethylene film. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25011
王岩旭, 陈洋, 王丽, 王柯, 傅强. 膨体聚四氟乙烯薄膜制备过程中的拉伸形变机理及纵向拉伸比的选择. 高分子学报, doi: 10.11777/j.issn1000-3304.2025.25011 DOI： CSTR： 32057.14.GFZXB.2025.7355.

Wang, Y. X.; Chen, Y.; Wang, L.; Wang, K.; Fu, Q. Deformation mechanism and selection of longitudinal stretching ratio in the preparation process of expanded polytetrafluoroethylene film. Acta Polymerica Sinica, doi: 10.11777/j.issn1000-3304.2025.25011 DOI： CSTR： 32057.14.GFZXB.2025.7355.

摘要

有机多孔膜材料在诸多领域广泛应用，然而聚乙烯、聚丙烯等常用材料存在不耐高温、抗氧化及耐化学腐蚀性能差等缺陷. 聚四氟乙烯(PTFE)具备卓越的耐化学腐蚀性、高低温耐受性和良好力学性能，其高温拉伸成孔法制备微孔膜在工业上应用广泛，但高温拉伸过程中的结构演变与形态变化因缺乏追踪表征技术而难以探究. 本研究以膨体聚四氟乙烯(ePTFE)基材为研究对象，先横向拉伸再纵向拉伸制备ePTFE微孔膜. 横向拉伸过程中，通过扫描电子显微镜(SEM)、二维小角X射线散射(2D-SAXS)和差式扫描热分析(DSC)等测试手段发现，ePTFE微观结构和形态演变可以以应变200%为分界，分为两个阶段，各阶段纤维、微孔等结构变化规律明显，且与结晶度变化相关. 纵向拉伸研究表明，纵向拉伸比显著影响ePTFE薄膜的孔径、孔隙率、表面粗糙度及力学性能，其中6~8倍纵向拉伸比在实际应用中综合性能较优. 本研究成果为深入理解ePTFE拉伸形变机理提供了关键依据，对实际生产中纵向拉伸比的合理选择具有重要指导价值，有助于推动ePTFE微孔膜的工业生产优化.

Abstract

Organic porous membrane materials are widely used in many fields

but commonly used materials such as polyethylene and polypropylene have defects such as poor high temperature resistance

oxidation resistance

and chemical corrosion resistance. Polytetrafluoroethylene (PTFE) has excellent chemical corrosion resistance

high and low temperature resistance

and good mechanical properties. Its high-temperature stretching method for preparing microporous membranes is widely used in industry. However

the structural evolution and morphological changes during high-temperature stretching are difficult to explore due to the lack of tracking and characterization techniques. This study takes expanded polytetrafluoroethylene (ePTFE) substrate as the research object

and prepares ePTFE microporous membrane by transverse stretching and then longitudinal stretching. During the transverse stretching process

it was found through testing methods such as scanning electron microscopy (SEM)

two-dimensional small angle X-ray scattering (2D-SAXS)

and differential scanning calorimetry (DSC) that the microstructure and morphological evolution of ePTFE can be divided into two stages with a strain of 200% as the boundary. The structural changes of fibers

micropores

and other structures in each stage are obvious and related to changes in crystallinity. Longitudinal stretching studies have shown that the longitudinal stretching ratio significantly affects the pore size

porosity

surface roughness

and mechanical properties of ePTFE films

with 6-8 times the longitudinal stretching ratio showing better overall performance in practical applications. This research provides a key basis for a deeper understanding of the tensile deformation mechanism of ePTFE

and has important guiding value for the reasonable selection of longitudinal stretching ratio in actual production

which helps to promote the industrial production optimization of ePTFE microporous membranes.

关键词

Keywords

references

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