plasticization of the polymers by the drug is indicated by the increase in the diffusivity of the drug in polyvinyl chloride and cellulose propionate , the increase in the rate and extent of sorption of a radiolabeled marker ( diazepam ) by the plastic , and the decreased stiffness of polyvinyl chloride exposed to higher concentrations of the drug .
C0032521
polymers
C0032167
plastic