Rapid advancement of molecular weight in polybenzazole oligomer

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

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528179, 528183, 528272, 528274, 528337, 528342, C08G 6300, C08G 6302, C08G 6942

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active

052330141

ABSTRACT:
The invention is a condensation polymerization reaction in which functionally terminated polybenzazole ligomers are reacted in a solvent acid at a temperature of at least 150.degree. C. and a shear of at least about 10 sec..sup.-1 under conditions so that the desired molecular weight is reached in no more than about 4 hours. The oligomers may be, for example, derived from the reaction of 4,6-diaminoresorcinol bis(hydrochloride) and terephthalic acid. The concentration of oligomers is high enough so that the reaction mixture contains liquid crystalline domains.

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Wolfe et al, "Rigid-Rod Polymers 2. Synthesis and Thermal Properties of Para-Aromatic Polymers with 2,6-Benzobisthiazole Units in the Main Chain," 14 Macromolecules 915 (1981).

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