Synthesis of Acetoxy Substituted Polyimide Copolymers for Improved Solubility in Organic Solvents
- Authors
- Jeong, H.-R.; Huh, T.-H.; Kwark, Y.-J.
- Issue Date
- Jun-2021
- Publisher
- Korean Fiber Society
- Keywords
- Acetoxy group; Chemical imidization; Solubility; Soluble polyimide; Yellow index
- Citation
- Fibers and Polymers, v.22, no.6, pp.1496 - 1501
- Journal Title
- Fibers and Polymers
- Volume
- 22
- Number
- 6
- Start Page
- 1496
- End Page
- 1501
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/41155
- DOI
- 10.1007/s12221-021-0924-y
- ISSN
- 1229-9197
- Abstract
- Polyimides (PIs) possess excellent thermal and mechanical properties, but their poor solubility in organic solvents restricts their utility. Numerous studies have focused on improving PI solubility by weakening inter-molecular interactions within the polymer. The polyimide composed of aromatic anhydride, 6,6′-(hexafluoroisopropylidene)dipthalic anhydride and aromatic diamine, 4,4′-oxidianiline, is known to be soluble, but solubility at room temperature is very limited. In this study, a soluble polyimide copolymer, 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (Bis-ap-af), a diamine containing hydroxyl groups, was incorporated into the above-mentioned PI via chemical and thermal imidization. Chemical imidization resulted in the acetylation of the hydroxyl groups of Bis-ap-af units, while the hydroxyls remained intact under thermal imidization conditions. The acetoxy-containing soluble polyimide copolymers displayed improved solubility in a number of organic solvents compared to the conventional PI, and the copolymer films maintained their mechanical properties and presented reduced yellowness. © 2021, The Korean Fiber Society for Fibers and Polymers and Springer.
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