HEAT PULSE METHOD FOR THERMAL-DIFFUSIVITY MEASUREMENTS OF PVDF PMMA BLENDS/

A heat pulse method for thermal diffusivity measurements of PVDF/PMMA blends is described. It is based on measurement of temperature rise by a sensing electrode when a heat pulse is given by a heating electrode . From curve-fitting between experimental results and the solution of equation of heat conduction, thermal diffusivities of PVDF/PMMA blends can be determined. This method is applied to melt-quenched PVDF/PMMA blends with various PMMA contents and 70/30 wt% PVDF/PMMA blends which are annealed for 1 hour at various temperatures. Near the alpha to be ta phase transition, their thermal diffusivities show anomalous behavi or. For the PVDF content below 60 wt%, thermal diffusivities of PVDF/P MMA blends monotonically increase with decreasing PVDF content.