In-situ fabrication of polyimide microphase and its effects on the mechanical and dielectric properties of polytetrafluoroethylene composite films

[Display omitted] Due to the ultralow surface energy of polytetrafluoroethylene (PTFE), PTFE composites usually exhibit poor interfacial interaction and mechanical performances. Herein, a water-soluble precursor of polyimide (PI) was added into the PTFE aqueous emulsion, and well-distributed PI micr...

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Published inComposites. Part A, Applied science and manufacturing Vol. 166; p. 107381
Main Authors Li, Renke, Liu, Zhiyu, Chen, Rong, Guo, Shaoyun
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.03.2023
Subjects
Casting
Hybrid
Microstructural analysis
Polymer-matrix composites
Polymer-matrix composites
Hybrid
Casting
Microstructural analysis
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Summary:[Display omitted] Due to the ultralow surface energy of polytetrafluoroethylene (PTFE), PTFE composites usually exhibit poor interfacial interaction and mechanical performances. Herein, a water-soluble precursor of polyimide (PI) was added into the PTFE aqueous emulsion, and well-distributed PI microphase was in-situ constructed in PTFE matrix through the thermal imidization of the precursor during the sintering process of PTFE. The well-distributed PI microphase resulted in significant improvements in the tensile strength, stiffness, and creep-resistance of PTFE. Compared with pure PTFE, the tensile strength and Young’s modulus of PTFE/PI (5 wt%) film increased by 28.1% and 122.3%, and the creep strain decreased by 42.4%. Meanwhile, the film maintained high elongation at break (308.4%), low dielectric constant and loss (2.09 and 0.0014 @10 GHz), exhibiting great potential in the field of high-frequency communication.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2022.107381