Kinetics of crystallization of some fractions of polyethylene succinate

Abstract

Abstract Polyethylene succinate, prepared by condensation in solvents, has been fractionated into 6 fractions by repeated solvation and precipitation. Molecular weights of the fractions have been obtained by cryoscopic and titrimetric measurements. Dilatometric measurements at various temperatures gave the specific volumes of all fractions. The melting point ( T m )‐molecular weight relationship follows the function: The velocity of crystallization of the polyester has been calculated from the change of volume with time during crystallization. It has a maximum at 30°C. for all chain lengths. The reciprocal half‐time of crystallization at the same temperature of crystallization decreases with increasing molecular weight of the polyester and finally approaches a limiting value.