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Fluorinated Colorless Polyimides with High Heat-resistance and Low Birefringence

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Abstract

The development of optical films with high transparency, high thermal resistance and low birefringence remains a challenge in the flexible display industry. In this work, we designed and synthesized a series of fluorinated colorless polyimides (CPIs) materials using 2,5-substituted m-phenylenediamine diamine monomers and 1,2,4,5-cyclohexanetetracarboxylic dianhydride (CHDA). We systematically studied the effects of fluorinated group substitutions on the thermal, mechanical, optical and dielectric properties of CPI films. The introduction of alicyclic CHDA dianhydride affords high transparency and low yellowness, while the 2,5-substituted m-phenylenediamine diamines offer the CPIs with quite low birefringence as well as high glass transition temperatures. A particular CHDA/o3FBDA film with simple chemical structure stands out, exhibiting well-balanced overall properties.

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Acknowledgments

This work was financially supported by the Natural Science Foundation of Guangdong Province (No. 2022A1515010125), the Key-Area Research and Development Program of Guangdong Province (No. 2020B010182002), the Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515110543), the R&D Program of Guangzhou (No. 2023A04J1577), the Major Program of National Natural Science Foundation of China (No. 51890871), the Recruitment Program of Guangdong (No. 2016ZT06C322), the 111 Project (No. B18023) and Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application at Soochow University. We thank Prof. Rongrong Hu and Dr. Guanfei Yao of South China University of Technology for the assistance in GPC measurement.

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Correspondence to Feng Bao or Ming-Jun Huang.

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Zou, BY., Qiu, LH., Lei, HY. et al. Fluorinated Colorless Polyimides with High Heat-resistance and Low Birefringence. Chin J Polym Sci 41, 1599–1608 (2023). https://doi.org/10.1007/s10118-023-3011-6

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  • DOI: https://doi.org/10.1007/s10118-023-3011-6

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