Antiplasticization in the Slightly Plasticized Polyvinyl Chloride

For the slightly plasticized polyvinyl chloride (PVC), one observes not only a usual plasticization in the glass transition region but also "antiplasticization" in the glassy state.The α-dispersion of the PVC is broadened and shifted toward the low temperature side by the presence of a small amount of plasticizers, while the β-dispersion of the PVC is suppressed. The effect on the α-dispersion depends on each plasticizer species, while the effect on the β-dispersion is independent of the plasticizer species.The characteristics of the antiplasticization phenomenon are summarized and discussed on the basis of the results of the new viscoelastic measurements.