Synthesis and Properties of Novel Fluorinated Poly(amide-imide)s from the 4,4′-Bis(4-trimellitimido-2-trifluoromethylphenoxy)biphenyl and Aromatic Diamines
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- 作者：Chin-Ping Yang and Yu-Yang Su
- 关键词：4 ; 4′ ; bis(4 ; trimellitimido ; 2 ; trifluoromethyl phenoxy)biphenyl ; diimide ; dicarboxylic acid ; poly(amide ; imide)s
- 刊名：Journal of Polymer Research
- 出版年：2005
- 出版时间：February 2005
- 年：2005
- 卷：12
- 期：1
- 页码：17-22
- 全文大小：272 KB
文摘
A novel fluorinated diimide dicarboxylic acid, 4,4′-bis(4-trimellitimido-2-trifluoromethylphenoxy)biphenyl (III), was synthesized from the condensation of 4,4′-bis(4-amino-2-trifluoromethylphenoxy)biphenyl (I) and trimellititc anhydride. A series of soluble poly(amide-imide)s (PAI) Va–h having inherent viscosities of 0.56–0.97 dL/g were prepared from reacting III with an equivalent amount of diamines by direct polycondensation using triphenyl phosphite and pyridine as condensing agents. The polymer V series afforded tough, transparent, and flexible films. They had tensile strengths ranging from 88 to 112 MPa, elongations at break from 8 to 31 % , and initial moduli from 1.9 to 2.7 GPa. The glass-transition temperature (Tg) of the polymers was recorded at 235–300 ○C. They had 10 % weight loss at a temperature above 502 ○C and left more than 54 % residue even at 800 ○C in nitrogen. In comparison with the nonfluorinated PAI VI series, the fluorinated V exhibited better solubility.