Syntheses and properties of novel fluorinated polyamides based on a bis(ether-carboxylic acid) or a bis(ether amine) extended from bis(4-hydroxyphenyl)phenyl-2,2,2-trifluoroethane

被引:37
作者
Hsiao, SH [1 ]
Chen, WT [1 ]
机构
[1] Tatung Univ, Dept Chem Engn, Taipei 104, Taiwan
关键词
polyamides; fluorine-containing; new monomer; solubility; thermal properties; fluoropolymers; structure-property relations; high performance polymers;
D O I
10.1002/pola.10585
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Two series of novel fluorinated aromatic polyamides were prepared from 1,1-bis[4-(4-carboxyphenoxy)phenyll-1-phenyl-2,2,2-trifluoroethane with various aromatic diamines or from 1, 1-bis [4-(4-aminophenoxy)phenyll-1-phenyl-2,2,2-trifluoroethane with various aromatic dicarboxylic acids with the phosphorylation polyamidation technique. These polyamides had inherent viscosities ranging from 0.51 to 1.54 dL/g that corresponded to weight-average and number-average molecular weights (by gel permeation chromatography) of 36,200-80,000 and 17,200-64,300, respectively. All polymers were highly soluble in aprotic polar solvents, such as N-methyl-2-pyrrolidone and NN-dimethylacetamide, and some could even be dissolved in less-polar solvents like tetrahydrofuran. The flexible and tough films cast from the polymer solutions possessed tensile strengths of 76-94 MPa and initial moduli of 1.70-2.22 GPa. Glass-transition temperatures (T-g's) and softening temperatures of these polyamides were observed in the range of 185-268 degreesC by differential scanning calorimetry or thermomechanical analysis. Decomposition temperatures (T-d's) for 10% weight loss all occurred above 500 degreesC in both nitrogen and air atmospheres. Almost all the fluorinated polyamides displayed relatively higher T-g and T-d values than the corresponding nonfluorinated analogues. (C) 2002 Wiley Periodicals, Inc.
引用
收藏
页码:420 / 431
页数:12
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