Synthesis and preliminary evaluation of ordered aliphatic poly(benzoxazole amides)

Slightly modified conventional techniques were successfully applied to prepare aliphatic benzoxazolediamines and the corresponding high molecular weight polyamides, which could be spun into excellent fibers. Compared to regular aliphatic polyamides, these products showed higher transition temperatures, improved thermal and light stability, and increased affinity for acid dyes. In addition—quite unexpectedly—these fibers were highly crystalline and oriented after drawing at elevated temperatures.