SYNTHESIS AND CHARACTERIZATION OF POLYESTERS CONTAINING HETEROCYCLIC THIAXANTHONE UNITS

被引:5
作者
REDDY, TA
SRINIVASAN, M
机构
[1] Indian Inst of Technology, Madras, India, Indian Inst of Technology, Madras, India
关键词
AROMATIC POLYMERS - Stability - POLYMERIZATION - Condensation Reactions - POLYMERS - Spectroscopic Analysis;
D O I
10.1002/pola.1987.080251105
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Several polyesters containing thiaxanthone rings were prepared from 2,7-dichloroformylthiaxanthone-5,5 prime -dioxide (IVa), 2,8-dichloroformylthiaxanthone-5,5 prime -dioxide (IVb), and bisphenols by solution polycondensation. The 2,8-diethoxycarbonylthiaxanthone-5,5 prime -dioxide (V) was prepared and characterized by spectral methods to confirm the formation of 2,8-thiaxanthonedicarboxylic acid-5,5 prime -dioxide (IVb). Prior to polymer synthesis two model compounds, 2,7-diphenoxycarbonylthiaxanthone-5,5 prime -dioxide (MDE-1) and 2,8-diphenoxycarbonylthiaxanthone-5,5 prime -dioxide (MDE-2), were synthesized and characterized by spectral methods. The polyesters were obtained in 62-78% yield and had inherent viscosities in the range 0. 42-0. 90 dL/g. The effect of thiaxanthone rings on solubility, crystallinity, and thermal stability of the polyesters are also discussed. The polyesters have decomposition temperatures in the range 372-438 degree C.
引用
收藏
页码:2987 / 3003
页数:17
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