Preparation of sulfonated naphthalene polyoxadiazoles polymers

摘要

Described is the preparation of sulfonated polyoxadiazole polymers with a high degree of sulfonation and good flammability properties. The polymers are useful in articles such as fibers.

主权项

1. A process for preparing a polymer, comprising the steps of:
a) combining hydrazine, oleum, 2,6-naphthalene dicarboxylic acid, terephthalic acid and isophthalic acid, to form a reaction mixture, wherein
i) the oleum is added in an amount of at least about 4 molar equivalents of SO3 based on the number of moles of hydrazine,ii) the oleum is added in one step, andiii) the reaction mixture comprises about 1 molar % to about 50 molar % of 2,6-naphthalene dicarboxylic acid and about 50 molar % to about 99 molar of terephthalic acid and isophthalic acid, based on the total amount of 2,6-naphthalene dicarboxylic acid, terephthalic acid and isophthalic acid present; and b) heating the reaction mixture to a temperature of about 100° C. to about 180° C. until a polymer is prepared.