PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective therm...PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective thermal conductivity of PVC/CdS nanocomposites has also been done using transient plane source (TPS) method. The effects of concentration of CdS nanoparticles and temperature on the effective thermal conductivity of polymer PVC/CdS nanocomposites have been studied. The variation of effective thermal conductivity with the concentration of filler particles and temperature has also been discussed in terms of dispersion of filler particles into polymer matrix and phonon scattering mechanism, respectively.展开更多
Kinetic studies of two-phase transformations i.e. glass transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using differential scanning calorimetry (DSC) at different heati...Kinetic studies of two-phase transformations i.e. glass transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using differential scanning calorimetry (DSC) at different heating rates under non-isothermal condition. The glass transition and crystallization regions have been investigated in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature Tc and activation energy. The activation energies of glass transition and crystallization have been calculated by employing peak shift method of Kissinger and isoconversional methods. Activation energies have been found to be dependent on the composition. The thermal stabili- ty is determined from the temperature difference ΔT = Tc — Tg where Tc and Tg are the onset crystallization and glass transition temperature respectively. It has been found that Ge15Se70Sb15 glass is thermally more stable as compared to the other members of the series.展开更多
文摘PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective thermal conductivity of PVC/CdS nanocomposites has also been done using transient plane source (TPS) method. The effects of concentration of CdS nanoparticles and temperature on the effective thermal conductivity of polymer PVC/CdS nanocomposites have been studied. The variation of effective thermal conductivity with the concentration of filler particles and temperature has also been discussed in terms of dispersion of filler particles into polymer matrix and phonon scattering mechanism, respectively.
文摘Kinetic studies of two-phase transformations i.e. glass transition and crystallization for GexSe70Sb30-x (x = 5, 10, 15, 20) glasses have been performed using differential scanning calorimetry (DSC) at different heating rates under non-isothermal condition. The glass transition and crystallization regions have been investigated in terms of their characteristic temperatures i.e. glass transition temperature Tg and crystallization temperature Tc and activation energy. The activation energies of glass transition and crystallization have been calculated by employing peak shift method of Kissinger and isoconversional methods. Activation energies have been found to be dependent on the composition. The thermal stabili- ty is determined from the temperature difference ΔT = Tc — Tg where Tc and Tg are the onset crystallization and glass transition temperature respectively. It has been found that Ge15Se70Sb15 glass is thermally more stable as compared to the other members of the series.
