Abstract
A prepolymer of polyamide was synthesized from condensation and copolymerization of three components composed of dimethyl isociuchomeronate, dimethyl adepate, and hexamethylenediamine in the presence of alcohol or without solvent. The results of estimation of its molecular weight by freezing point depression method and by estimation of terminal group indicated to be 400-1400 and it was found to be a compound of two to several molecules of diamine and diester. The prepolymer prepared by condensation copolymerization in solvent had higher molecular weight with relatively constant molar ratio. Further condensation copolymerization by fusion method was studied by estimating the viscosity of fused mass and it was found that the reaction was completed in 2.5-4 hours when the prepolymer prepared by solvent method was used and it showed no change in viscosity, while that prepared by using no solvent showed no end point of reaction and unusual increase in viscosity.
