The crystallization kinetics of poly (phenylene sulfide) (PPS) and its carbon fibre composites were investigated by dilatometry. An appreciable deviation from the Avrami equation was found for PPS-carbon fiber composites. PPS exhibits a moderate crystallization rate

and possesses a low σσ value

packing density coefficient kc

and a low pre-exponential term G0 of the equation of crystallization kinetics

in compare with polymers such as PE

PMO etc. Go has been found to be the chief factor for the crystallization rate of polymers. Those polymers which possess a lower ρa/ρc value will probablly show a higher crystallization rate.