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Quaternary Copolyimides with Various Monomer Contents: Thermal Property and Optical Transparency
- Authors
- Kim, Jeong-Cheol; Chang, Jin-Hae
- Issue Date
- Nov-2014
- Publisher
- POLYMER SOC KOREA
- Keywords
- quaternary copolyimide; transparent and colorless polyimide; thermal property; optical transparency
- Citation
- MACROMOLECULAR RESEARCH, v.22, no.11, pp 1178 - 1182
- Pages
- 5
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 22
- Number
- 11
- Start Page
- 1178
- End Page
- 1182
- ISSN
- 1598-5032
2092-7673
- Abstract
- Several quaternary copolyimides (Co-PIs) were prepared using various molar ratios of two dianhydrides and two diamines: 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 1,2,4,5-benzenetetracarboxylic dianhydride (pyromellitic dianhydride) (PMDA), 2,2'-bis(trifluoromethyl)benzidine (TFB), and trans-1,4-cyclohexanediamine (CHDA). Copolymerization of the monomers afforded poly(amic acid)s (PAA), which were solution-cast onto glass plates and subjected to thermal imidization to yield the Co-PI films. These Co-PI films showed no significant decomposition below 500 degrees C in a N-2 atmosphere. Finally, the films were colorless and exhibited high optical transparencies, with UV-vis. absorption edges of 342-367 nm and low yellow index (YI) values of 1.72-5.09.
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