期刊
HIGH PERFORMANCE POLYMERS
卷 34, 期 1, 页码 95-104出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/09540083211044054
关键词
Dielectric constant; dielectric loss; mechanical properties
资金
- Sichuan provincial targeted financial transfer payment project of high-tech zone in 2018 [2018GZ0596]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2019-4-36]
- Aeronautical Science Foundation of China [2019180Z7001]
The addition of PVDF to PI/TiO2 composite films significantly increases their dielectric constant and improves mechanical properties. With 50wt% PVDF particle loading, the properties of the composite films are significantly enhanced.
A series of three-phase composite films with different filler contents were prepared by in-situ polymerization. The composite films comprise polyimide (PI), poly (vinylidene fluoride) (PVDF), and titanium dioxide (TiO2). Compared with PI/TiO2 composite films, the PI/TiO2-PVDF composite films not only get a significant increase in dielectric constant, but also own better mechanical properties. Our results show that with the loading of 50wt% PVDF particles, the dielectric constant of PI/TiO2-PVDF composite films increased from 6.5 to 18.14 at 1 MHz and room temperature, while the tensile strength of PI/TiO2-PVDF composite films increased from 45 to 72 MPa. In addition, the films maintain a low loss tangent of about 0.02. PI/PVDF composite films were also prepared. It was found that dielectric constant of PI/PVDF composite was significantly lower than that of PI/TiO2-PVDF composite films when the loading of PVDF is 50wt%.
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