Abstract
Time and temperature dependence of ultimate properties in fluid fracture is reported for PVC-DOP solution (volume fraction of PVC, v2=0.04) and liquid polybutadiene (PBD). The method used was such that small quantity of the sample was injected into air from a narrow nozzle and let it fall in drops, namely the sample overloaded by the drop weight. A cylindrical part of the pendant from the nozzle was elongated and took time to break. The time was defined as breaking time tb. The drop weight W corresponding to load at break and associated tb were measured with various drop sizes at different temperatures. Six temperatures were selected in the range from 30°C to 80°C for PVC-DOP solution and from 11°C to 35°C for liquid PBD. In elongation processes, a change of drop sizes was very small and almost negligible. Weight vs. time curves at different temperatures can be superposed into an almost unified master curve by the horizontal shift. It seems that the shift factor for the ultimate properties follows the prediction of the Arrhenius equation.
Furthermore, a relation between the shift factors aT for both fluid fracture of PVC solution and creep deformation of PVC-DOP sheets was examined. The creep data were obtained in the temperature range from 2.5°C to 29.5°C for PVC-DOP sheets having different volume fractions of PVC ranging from 0.191 to 0.699.
It is found that the shift factor aT for the fluid fracture is almost equal to that predicted from the values of aT for creep deformation. Thus the values of log aT are given by the Arrhenius equation above 30°C, and close to the WLF equation below 30°C.
