SYNTHESIS FROM ALIPHATIC DIAMINES OF POLYAMIDES CONTAINING A FIRE-MEMBERED LACTONE UNIT IN MAIN-CHAIN AND THEIR PROPERTIES

Polycondensations of myl-2-chloroformylmethyl-2,4-dimethyl-4-butanolid e with 1, n-alkanediamines (n = 2 similar to 6) and p-xylyrenediamine resulted in aliphatic polyamides with partial cleavage of the lactone moiety, except 1,2-ethanediamine. The polycondensation of acid dichlor ide with piperadine gave a polyamide without cleavage of the lactone m oiety, in analogy with phenylenediamines. All of the resulting polyami des possessed initiation temperatures for thermal decomposition above 300 degrees C. The percentage of water content and glass transition te mperature of the corresponding polyamides increased with decrease in t he carbon number of alkanediamines.