Construction of semi-fluorinated polyimides with perfluorocyclobutyl aryl ether-based side chains

Literature Information

Publication Date 2018-01-24
DOI 10.1039/C8PY00004B
Impact Factor 5.582
Authors

Mingchen Jia, Mingtao Zhou, Yongjun Li, Guolin Lu, Xiaoyu Huang


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Abstract

In view of cost reduction and environmental protection, achieving low dielectric constant (k value) at low fluorine content is of great significance. Incorporation of perfluorocyclobutyl (PFCB) aryl ether-containing side chains into polyimide, which is expected to impede compact stacking of polymer chains and increase the fraction of free volume (FFV) as a consequence, may be an effective strategy to reduce the k value of polyimide. A series of PFCB aryl ether-containing polyimides with various side chain lengths and side chain contents are produced. To our delight, a nearly state-of-art k value of 2.31 is achieved at a fluorine content of 23.8%, representing the highest efficiency of fluorine atom in reducing the dielectric constant of polyimide and confirming the effectiveness of side chain fluorine chemistry. Positron annihilation lifetime spectroscopy (PALS) and dual-processed weight change experiment results indicate that the dielectric constant of semi-fluorinated polyimide is determined by the opposite actions exerted by FFV and water absorption. Moreover, this kind of fluorine-containing polyimide is proved to be an eligible candidate for dielectric applications with excellent overall performance in dielectric constant as well as thermal stability and mechanical strength.

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Polymer Chemistry

Polymer Chemistry
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