Syntheses and Characterizations of Colorless and Transparent Poly(amide imide) Copolymer
- Authors
- Do Lee, Young; Kim, Kisoo; Ok, Youngjin; Kim, Moosong; Chang, Jin-Hae
- Issue Date
- Mar-2016
- Publisher
- POLYMER SOC KOREA
- Keywords
- copoly(amide imide); colorless and transparent polyimide; thermo-mechanical properties; optical transparency
- Citation
- POLYMER-KOREA, v.40, no.2, pp 298 - 305
- Pages
- 8
- Journal Title
- POLYMER-KOREA
- Volume
- 40
- Number
- 2
- Start Page
- 298
- End Page
- 305
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26975
- DOI
- 10.7317/pk.2016.40.2.298
- ISSN
- 0379-153X
2234-8077
- Abstract
- N,N'-[2,2'-bis(trifluoromethyl)-4,4'-biphenyleneibis(4-aminobenzamide) (TFAB) was synthesized from 4nitrobenzoyl chloride and 2,2'-bis(trifluoromethyl)benzidine (TFB). The obtained TFAB, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), and 4,4'-biphthalic anhydride (BPA) were used to synthesize polyimide copolymers (Co-PIs) containing amide groups. Flexible and tough Co -PI films were prepared from poly(amic acid) (PAA) through solution -casting using chemical and thermal imidization methods. The thermomechanical properties and optical transparency of the Co -PI films with various BPA monomer contents were investigated. The coefficients of thermal expansions (CTEs) of the Co -PI films were improved linearly with increasing BPA content. However, their optical transparency was found to worsen with increasing BPA content.
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