1. Optically transparent and colorless poly(ether-imide)s derived from a phenylhydroquinone bis(ether anhydride) and various trifluoromethyl-substituted bis(ether amine)s.
- Author
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Chin-Ping Yang, Yung-Chung Chen, Sheng-Huei Hsiao, Wenjeng Guo, and Hui-Min Wang
- Subjects
TRIFLUOROIODOMETHANE ,AMIC acids ,LIGHT transmission ,NITROGEN ,ORGANIC solvents - Abstract
series of colorless and organosoluble poly(ether-imide)s (PEIs) were prepared from a phenylhydroquinone bis(ether anhydride), i.e., 2,5-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride, and seven trifluoromethyl-containing bis(ether amine)s by the conventional two-stage process via the thermal or chemical imidization of the precursor poly(amic acid)s. The fluorinated PEIs prepared via the chemical imidization procedure had inherent viscosities of 0.46-1.27 dL/g and weight-average molecular weights of 68,000-87,500. The PEIs exhibited good solubility in a variety of organic solvents; they were readily soluble in amide-type polar solvents and chlorinated hydrocarbons on a concentration higher than 10%. The solution-cast films showed a high optical transparency and low color intensity, with an ultraviolet-visible absorption edge of 368-375 nm and a yellowness index of 5.9-9.9. These films were flexible and tough with tensile strengths of 89-114 MPa. They exhibited glass-tranisition temperatures of 198-250°C and 10% weight loss temperatures higher than 488°C in air or nitrogen. In addition, these PEI films also displayed low dielectric constants (3.22-3.52 at 1 MHz) and low moisture absorptions (0.22-0.73 wt%). [ABSTRACT FROM AUTHOR]
- Published
- 2010
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