Abstract
Dielectric measurements were carried out on two polymer blends consisting of an eco-friendly polymer poly(lactic acid) (PLA) and polyethers: One was PLA/poly(ethylene grycol) (PEG) with molecular weight M of 300 and the other was PLA/poly(propylene glycol) (PPG) with M=1000. The DSC thermograms indicated that PLA/PEG and PLA/PPG were miscible in the range of PLA content above 60 and 75 %, respectively. Corresponding to the thermal data, PLA/PEG and PLA/PPG blends exhibited single dielectric loss peak in the miscible range. The loss curves were much broader than those of the components due to concentration fluctuation. The amplitude of concentration fluctuation was assessed from the temperature dependence of the half width of the dielectric loss curves by assuming the Gaussian distribution of local concentration.
