Synthesis and Characterization of Thianthrene Containing Poly(benzoxazole)s
Polymers and High Performance Materials
New thioether- and thianthrene-containing poly(benzoxazole)s (PBOs) were synthesized from 4,4'-thiobis[3-chlorobenzoic acid] and thianthrene-2,7- and -2,8-dicarbonyl chlorides with commercially available bis-o-aminophenols. Polymers were prepared via solution polycondensation in poly(phosphoric acid) at 90-200 degrees C. Transparent PBO films were cast directly from polymerization mixtures or m-cresol. The films were flexible and tough. Nonfluorinated PBOs were soluble only in strong acids and AlCl3/NO(2)R systems by forming complexes with the benzoxazole heterocycle. Glass transition temperatures ranged from 298-450 degrees C, and thermogravimetric analysis showed good thermal stabilities in both air and nitrogen atmospheres. (C) 1995 John Wiley and Sons, Inc.
Journal of Polymer Science Part A: Polymer Chemistry
Johnson, R. A.,
Mathias, L. J.
(1995). Synthesis and Characterization of Thianthrene Containing Poly(benzoxazole)s. Journal of Polymer Science Part A: Polymer Chemistry, 33(11), 1901-1906.
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