Tunable Permittivity in High-Performance Hyperbranched Polyimide Films by Adjusting Backbone Rigidity
Tunable Permittivity in High-Performance Hyperbranched Polyimide Films by Adjusting Backbone Rigidity
复制标题
通过调整骨架刚性来调节高性能超支化聚酰亚胺薄膜的介电常数
DOI：
10.1021/acs.jpcc.5b11667
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发表时间：
2016-02-11
影响因子：
3.7
通讯作者：
Zhang, Qiuyu
中科院分区：
文献类型：
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作者：
Lei, Xingfeng;Qiao, Mingtao;Zhang, Qiuyu
Currently, low-dielectric polyimides (PIs) such as fluorinated or porous PIs exhibit a low-dielectric property but have undesirable mechanical and/or thermal properties. Therefore, it is crucial to find a more considerate method that could lower the permittivity, while maintaining or improving the mechanical and thermal properties. Herein, a series of hyperbranched (HB) PI films were synthesized by adjusting the content of the rigid diamine, 2,2′-dimethylbenzidine (DMBZ). The dielectric properties of the HBPIs were accordingly tuned, that is, the permittivity of the resulting HBPIs decreased with increasing the DMBZ fraction owing to the enlarged free volume and the hindered dipole orientations afforded by the rigid DMBZ. The maximum mechanical strength of the resulting HBPIs located at the formulation made using 50% DMBZ and 50% ODA. At this formulation, the optimal comprehensive performances were achieved, that is, excellent tensile strength (124.1 MPa), desirable thermal stability (5% weight loss tempe...
