Wholly aromatic polyamide foam

摘要

Aromatic polyamide foams having a density of 0.025 to 0.7 g./cm.3 are prepared by heating N-alkyl aromatic polyamides having at least one beta hydrogen atom on the alkyl groups, a plasticizer and an aromatic sulfonic acid catalyst at 250 DEG to 340 DEG C. for a length of time sufficient to remove substantially all of the N-alkyl groups.