Colorless and Transparent Copolyimide Nanocomposites
- Authors
- Bae, Hye-Jin; Kim, Yong Seok; Chang, Jin-Hae
- Issue Date
- Dec-2014
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Copolyimide; Thermal Property; Optical Transparency; Gas Permeation
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.12, pp 9644 - 9652
- Pages
- 9
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 14
- Number
- 12
- Start Page
- 9644
- End Page
- 9652
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/26946
- DOI
- 10.1166/jnn.2014.10151
- ISSN
- 1533-4880
1533-4899
- Abstract
- Copolyimides (Co-PIs) were synthesized from 2,2'-bis(trifluoromethyl) benzidine (TFB) and different ratios of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and pyromellitic dianhydride (PMDA). The Co-PI films were obtained from poly(amic acid) (PAA) by solution-casting through typical chemical and thermal imidizations. The thermal properties and optical transparency of the Co-PI films with various PMDA monomer contents were investigated. It was found that with increasing PMDA content, the thermal transition temperatures of the Co-PI films increased. Co-PI nanocomposites were prepared with various amounts of organically modified hectorite (STN) on a TFB:6FDA:PMDA = 1.0:0.9:0.1 mole ratio Co-PI hybrid film to examine the thermal properties, morphology, and optical transparency. The thermo-optical properties of the Co-PI hybrid films deteriorated with increasing clay content. However, the coefficient of thermal expansion (CTE) and oxygen barrier properties of the PI hybrid films improved with increasing clay content.
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