PVC-可塑剤系における塑性流動と粘性流動

抄録

It seems that plasticity and viscosity in the flow caused by deformation will change from one to the other continuously according to the temperature or concentration of diluent added to the material. A preliminary investigation was reported to verify the possibility of continuous change from plasticity to viscosity. The samples used were Poly (vinyl chloride) plasticized with diethyl phthalate (DEP). The difference between plasticity and viscosity was decided by creep and its recovery data, and the flow curves obtained from the stress-strain data. The measurements of the creep and its recovery were made at temperatures ranging from 40°C to 70°C. The stressstrain data were obtained at the same temperatures and at strain rates between 0.014min^-1. and 2.23min^-1. The temperature and concentration region where the flow behavior would change from viscosity to plasticity were decisively located, but it was necessary to examine closely whether the usual definition of plasticity and viscosity was properly applicable or not to the amorphous polymers.