The evolution of tan
ı
(solid line for the matrix and filled circles for the composite in Fig. 2) with temperature displays two relaxation processes. These two relaxations occur in the temperature range where the modulus drops, and are representative of the heterogeneous nature of the glycerol plasticized starch system,an already well-known feature. The low temperature relaxation process is ascribed to the main relaxation associated with the glass transition of glycerol-rich domains where as the high temperature relaxation corresponds to starch rich domains,as already reported