Journal
POLYMERS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/polym11030489
Keywords
transparent polyimide-silica composite; sol-gel reaction; thermal imidization process; coefficient of thermal expansion; haze; yellowness index
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea [20163010012310]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry and Energy, Republic of Korea [20174030201760]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20174030201760, 20163010012310] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Polyimide (PI) composite films with thicknesses of approximately 100 mu m 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/degrees 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.
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