MELT CRYSTALLIZATION KINETICS OF SYNDIOTACTIC POLYSTYRENE

The crystallization kinetics of syndiotactic polystyrene (SPS) were st udied using nonisothermal DSC analysis. Crystallization rates and half -times were determined from the glass transition temperature (approxim ately 100-degrees-C) up to the melt temperature (approximately 270-deg rees-C) for various molecular weight SPS polymers. The results suggest that the crystallization rate of SPS is molecular weight dependent. T hese results are also compared with previously determined crystallizat ion kinetics of high density polyethylene. The maximum crystallization rate of high density polyethylene is approximately ten times greater than that of SPS.