Effect of temperature on terminal dynamics of polymer blend and its constituents

Analysis of terminal relaxation time (λ) of the blend’s components along with the blends at different temperatures (130 t0 270 oC) via thermorheological investigations for LDPE/HDPE blends reveals that temperature dependence of the rheology of the components is different. The relaxation time of LDPE shows dramatic change with temperature compared to that of HDPE. Three regions for the terminal relaxation time of the components can be considered as temperature varies. In temperature range of 170-190 oC there is symmetry in dynamics of the constituents but at other temperatures, terminal dynamics of blend’s components become different. Moreover, depending to test temperature, dynamics of a given component in the blend may be faster or slower than in the pure state.

کلیدواژه ها:

polyethylene blend ، terminal dynamics ، thermorheology ، relaxation