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Polymers 2019, 11(3), 489; https://doi.org/10.3390/polym11030489

Preparation and Characterization of Transparent Polyimide–Silica Composite Films Using Polyimide with Carboxylic Acid Groups

1
School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Korea
2
Pohang Accelerator Laboratory, POSTECH, Pohang 37673, Korea
3
Department of Chemistry, Kangwon National University, Chunchon 24341, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 30 January 2019 / Revised: 22 February 2019 / Accepted: 7 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Advanced Engineering Plastics)
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Abstract

Polyimide (PI) composite films with thicknesses of approximately 100 µm were prepared via a sol–gel reaction of 3-aminopropyltrimethoxysilane (APTMS) with poly(amic acid) (PAA) composite solutions using a thermal imidization process. PAA was synthesized by a conventional condensation reaction of two diamines, 3,5-diaminobenzoic acid (DABA), which has a carboxylic acid side group, and 2,2′-bis(trifluoromethyl)benzidine (TFMB), with 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) in N,N-dimethylacetamide (DMAc). The PAA–silica composite solutions were prepared by mixing PAA with carboxylic acid side groups and various amounts of APTMS in a sol–gel process in DMAc using hydrochloric acid as a catalyst. The obtained PI–silica composite films showed relatively good thermal stability, and the thermal stability increased with increasing APTMS content. The optical properties and in-plane coefficient of thermal expansion (CTE) values of the PI–silica composite films were investigated. The CTE of the PI–silica composite films changed from 52.0 to 42.1 ppm/°C as the initial content of APTMS varied. The haze values and yellowness indices of the composite films increased as a function of the APTMS content. View Full-Text
Keywords: transparent polyimide–silica composite; sol–gel reaction; thermal imidization process; coefficient of thermal expansion; haze; yellowness index transparent polyimide–silica composite; sol–gel reaction; thermal imidization process; coefficient of thermal expansion; haze; yellowness index
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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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Moon, K.H.; Chae, B.; Kim, K.S.; Lee, S.W.; Jung, Y.M. Preparation and Characterization of Transparent Polyimide–Silica Composite Films Using Polyimide with Carboxylic Acid Groups. Polymers 2019, 11, 489.

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