Abstract

AbstractSix nylon salts [hexamethylenediammonium adipate (6.6), hexamethylenediammonium terephthalate (6.T), hexamethylenediammonium isophthalate (6.I), p‐xylylenediammonium adipate (PXD.6), m‐xylylenediammonium adipate (MXD.6), and m‐xylylenediammonium isophthalate (MXD.I)] were copolymerized with ε‐caprolactam. The resulting random copolyamides showed different modes of crystallization as confirmed by the melting temperature depression and the decrease in the isothermal crystallization rate. By selective hydrolysis it was found that the differences in Tm depression and isothermal crystallization rate were due to partial inclusion of comonomers in the crystal lattice. The effect of comonomer structure on the crystallization rate is also discussed.

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