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The change of molecular weight by heating was reported in the previous paper for polyamide. This phenomenon is treated kinetically for 6-nylon in this paper. Occurence of both polymerization and depolymerization seems to be the cause of this phenomenon. Both reactions are separated, using several experimental data, and change of number of molecules by polymerization is calculated against time. It becomes clear that this polymerization reaction is the second order for number of unreacteddoi:10.1295/koron1944.17.413 fatcat:p5jsjaz4trapvg62cekettb5qa