Synthesis of N-Methylated Polyamides and Copolyamides

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N-Methylated polyamides and copolyamides derived from sebacic acid, N,N′-dimethylethylenediamine, and ethylenediamine were synthesized. Both interfacial polycondensation and melt poly-condensation were examined, with the interfacial generally giving the higher molecular weights. The choice of organic solvent was important in the copolyamide synthesis with hexane giving random copolyamides and the more polar chloroform yielding copolyamides with a more blocklike structure, comparable to that obtained from the melt. The softening point of the N-methylated poly-amide was between 65-75°C.