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Polymers 2018, 10(5), 546;

High Performance Soluble Polyimides from Ladder-Type Fluorinated Dianhydride with Polymorphism

Wuhan National Research Center for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 403052, China
Key Laboratory of Pesticide and Chemical Biology of the Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
Authors to whom correspondence should be addressed.
Received: 20 April 2018 / Revised: 15 May 2018 / Accepted: 16 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Aromatic Polymers)
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A novel rigid semi-alicyclic dianhydride 9,10-difluoro-9,10-bis(trifluoromethyl)-9,10-dihydroanthracene-2,3,6,7-tetracarboxylic acid dianhydride (8FDA) was reported, and its single crystal X-ray diffraction result revealed the existence of the polymorphic structure in this compound. The detail geometric configuration transition during the synthesized process was investigated, exhibiting a transition of from trans- to cis- when the hydroxyl groups were substituted by fluoride with diethylaminosulfur trifluoride (DAST). Compared with the dianhydride 4,4′-(Hexaflouroisopropylidene) diphthalic anhydride (6FDA) and 1S,2R,4S,5R-cyclohexanetetracarboxylic dianhydride (HPMDA), the resulting polyimide (PI) films based on 8FDA exhibited an obviously higher glass transition temperature (Tg, 401 °C) and a much lower coefficient of thermal expansion (CTE, 14 ppm K−1). This indicates that 8FDA is an ideal building block in high-performance soluble PIs with low CTE. View Full-Text
Keywords: dianhydride; semi-alicyclic; polymorphic; coefficient of thermal expansion; polyimide dianhydride; semi-alicyclic; polymorphic; coefficient of thermal expansion; polyimide

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Li, F.; Liu, J.; Liu, X.; Wang, Y.; Gao, X.; Meng, X.; Tu, G. High Performance Soluble Polyimides from Ladder-Type Fluorinated Dianhydride with Polymorphism. Polymers 2018, 10, 546.

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