Characterizations of Copoly(ester imide)s with New 2,7-Dihydroxynaphthalene Bis(trimellitate anhydride)
- Authors
- Ju, Jieun; Chan, Jin-Hae
- Issue Date
- Sep-2014
- Publisher
- POLYMER SOC KOREA
- Keywords
- copolyimide; films; thermal property; gas permeation; optical transparency
- Citation
- POLYMER-KOREA, v.38, no.5, pp 632 - 639
- Pages
- 8
- Journal Title
- POLYMER-KOREA
- Volume
- 38
- Number
- 5
- Start Page
- 632
- End Page
- 639
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26687
- DOI
- 10.7317/pk.2014.38.5.632
- ISSN
- 0379-153X
2234-8077
- Abstract
- 2,7-Dihydroxynaphthalene bis(trimellitate anhydride) (2,7-TA) was synthesized from trimellitic anhydride chloride and 2,7-dihydroxynaphthalene. Copolyimides (Co-PI) containing ester group were synthesized from 2,7-TA, p-xylylenediamine, and 2,2'-bis(trifluoromethyl)benzidine (TFB). The Co-PI films were obtained from poly(amic acid) by solution casting through thermal imidization on a glass plate. The thermal property, gas permeation, and optical transparency of the Co-PI films with various TFB monomer contents were investigated. These Co-PIs could be solution-cast into a flexible and tough film. The cast Co-PI films exhibited high optical transparency with a cut-off wavelength of 370 similar to 395 nm in UV-vis. absorption and a low yellow index value of 3.55 similar to 7.63. The thermal property of Co-PI films increased linearly with increasing TFB content. However, the oxygen permeation and optical transparency of the Co-PI films was found to worsen with increasing TFB content.
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