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Preparation and properties of aromatic polyimides based on 4,4′‐(2,2,2‐trifluoro‐1‐phenylethylidene)diphthalic anhydride
Author(s) -
Lee DongHo,
Koo SeungYoung,
Lee HyungSeok,
Kim Woo Sik,
Min Kyung Eun,
Park Lee Soon,
Seo Kwan Ho,
Kang Inn Kyu,
Choi HeungJin
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10528
Subject(s) - moiety , pyromellitic dianhydride , polyimide , diamine , ether , polymer chemistry , glass transition , solubility , materials science , polymer , organic chemistry , chemistry , layer (electronics)
Aromatic polyimides were synthesized from aromatic carboxylic acid dianhydrides, 2,2‐bis(3,4‐dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), 4,4′‐(2,2,2‐trifluoro‐1‐phenylethylidene)diphthalic anhydride (3FDA), and pyromellitic dianhydride (PMDA), with four typical aromatic diamines. These included polyimide (PI) from 2,2‐bis(4‐aminophenyl)hexafluoropropane (4BDAP) by two‐step procedures; amidation to polyamic acid (PAA), followed by thermal imidization of PAA. The chemical and physical properties of the newly prepared polyimides were compared in terms of their chemical structures, inherent viscosity, thermal property, transmission, dielectric constant, UV cutoff, water absorption, and refractive index. PIs 3FDA/4BDAP and 6FDA/4BDAP were soluble in common organic solvents, whereas others were not. In particular, it was found that the solubility was dependent on the temperature of imidization. The chemical and physical properties of the newly prepared polyimides derived from 3FDA were similar to the polyimides derived from 6FDA. The solubility of polyimide containing an ether functional group in the dianhydride moiety was better than that of the ether functional group in the diamine moiety. The polymers with ether linkage in dianhydride moiety exhibited lower glass transition temperature than their functionality‐reversed analogous polymers with ether linkage in diamine moiety. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 38–44, 2002