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

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 mem...

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Bibliographic Details
Published in:Chinese journal of polymer science 2024-08, Vol.42 (8), p.1243-1252
Main Authors: Xie, Jie, Wu, Yong-Shi, Xie, Jia-Yi, Xu, Rui-Jie, Lei, Cai-Hong, Song, Sai-Nan, Li, Guang-Quan, Huang, An-Ping
Format: Article
Language:English
Subjects:
Bilayers
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Electrochemical analysis
Industrial Chemistry/Chemical Engineering
Lamellar structure
Lithium batteries
Melting points
Membranes
Permeability
Polymer Sciences
Porosity
Research Article
Stability
Wettability
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Summary: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.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-024-3157-x