Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes

Jie Xie; Yong-Shi Wu; Jia-Yi Xie; Rui-Jie Xu; Cai-Hong Lei; Sai-Nan Song; Guang-Quan Li; An-Ping Huang

doi:10.1007/s10118-024-3157-x

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Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes

RESEARCH ARTICLE | Updated：2024-08-06

- Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes
- Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes
- 高分子科学（英文版） 2024年42卷第8期页码：1243-1252
- Affiliations：
  
  a.School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
  b.Lanzhou Petrochemical Research Center, Petrochemical Research Insititute, PetroChina, Lanzhou 730060, China
  c.School of Chemistry and Civil Engineering, Shaoguan College, Shaoguan 512005, China
- Author bio：
  
  xuruijie@gdut.edu.cn (R.J.X.)
  lch528@gdut.edu.cn (C.H.L.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 52173033, 51773044 and 51603047), Research and Development Plan for Key Areas in Guangdong Province (No. 2019B090914002), Guangdong Province Science and Technology Plan Project (No. 2016A010103030), the Project of Science Foundation of Guangdong Province (No. 2021A1515011914), Foshan Science and Technology Innovation Project (No. FS0AA-KJ919-4402-0145), Commissioned development project by Lanzhou Chemical Research Center of PetroChina (No. kywx-23-010, 2022DJ6315).
- DOI：10.1007/s10118-024-3157-x
  中图分类号：
- 纸质出版日期：2024-08-01，
  
  网络出版日期：2024-06-26，
  
  收稿日期：2024-04-06，
  
  修回日期：2024-04-29，
  
  录用日期：2024-05-13
- Accepted：
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Xie, J.; Wu, Y. S.; Xie, J. Y.; Xu, R. J.; Lei, C. H.; Song, S. N.; Li, G. Q.; Huang, A. P. Influence of heat-setting temperature on the microporous structure and properties of PP/HDPE bilayer microporous membranes. Chinese J. Polym. Sci. 2024, 42, 1243–1252

Jie Xie, Yong-Shi Wu, Jia-Yi Xie, et al. Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes[J]. Chinese Journal of Polymer Science, 2024,42(8):1243-1252.
Xie, J.; Wu, Y. S.; Xie, J. Y.; Xu, R. J.; Lei, C. H.; Song, S. N.; Li, G. Q.; Huang, A. P. Influence of heat-setting temperature on the microporous structure and properties of PP/HDPE bilayer microporous membranes. Chinese J. Polym. Sci. 2024, 42, 1243–1252 DOI： 10.1007/s10118-024-3157-x.

Jie Xie, Yong-Shi Wu, Jia-Yi Xie, et al. Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes[J]. Chinese Journal of Polymer Science, 2024,42(8):1243-1252. DOI： 10.1007/s10118-024-3157-x.

摘要

The optimal heat-setting temperature for PP/HDPE bilayer separator is 130 ℃. At this temperature

the bilayer achieves maximum puncture strength

lowest Gueley value and ionic conductivity of 9.7 N

369 s/100 ml and 2.35×10

−3

S/cm

respectively. Heat setting at 130 °C enables the achievement of a high-safety composite separator with excellent performance.

Abstract

Due to the mechanical stability of PP layer

the PP/HDPE double-layer microporous membrane could be prepared at a higher heat-setting temperature than that of PE monolayer membrane. In this work

the effects of heat-setting temperature on the pore structure and properties of PP/HDPE double-layer membrane were studied. With the increase of heat-setting temperature from 120 °C to 130 °C

the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during heat-setting. The corresponding air permeability

porosity

wettability of liquid electrolyte and mechanical property of the heat-set microporous membrane increase

exhibiting better electrochemical performance. However

when the heat-setting temperature is further increased to 140 °C

higher than the melting point of PE resin

some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting

resulting in a decrease of air permeability and porosity. In contrast

there is negligible change in the PP layer within the above heat-setting temperature region. This study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting

which is helpful to guide the production of high-performance PP/PE/PP lithium batteries separator.

关键词

Keywords

PP/HDPE bilayer microporous membranesHeat-setting temperatureSAXS

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