期刊
EUROPEAN POLYMER JOURNAL
卷 42, 期 8, 页码 1705-1715出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2006.03.021
关键词
1,1-bis[4-(3,4-dicarboxyphenoxy)phenyl]cyclohexane dianhydride; fluorine-containing polyimide; bis(ether amine); colorless polyimide; soluble polyimide
A series of novel fluorinated poly(ether imide)s (IV) having inherent viscosities of 0.70-1.08 dL/g were prepared from 1,1-bis[4-(3,4-dicarboxyphenoxy)phenyl]cyclohexane dianhydride (I) and various trifluoromethyl (CF3)-substituted aromatic bis(ether amine)s IIa-g by a standard two-step process with thermal and chemical imidization of poly(amic acid) precursors. These poly(ether imide)s showed excellent solubility in many organic solvents and could be solution-cast into transparent, flexible, and tough films. These films were essentially colorless, with an ultraviolet-visible absorption edge of 375-380 nm and a very low b* value (a yellowness index) of 5.5-7.3. They also showed good thermal stability with glass-transition temperatures of 207-269 degrees C, 10% weight loss temperatures in excess of 474 degrees C, and char yields at 800 degrees C in nitrogen more than 62%. In comparison with analogous V series poly(ether imide)s without the -CF3 substituents, the IV series polymers showed better solubility, lower color intensity, and lower dielectric constants. (c) 2006 Elsevier Ltd. All rights reserved.
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