Miscibility of biodegradable aliphatic polyester and poly(vinyl acetate) blends

We report miscibility behavior for synthetic biodegradable aliphatic polyes ter (BDP) and poly(vinyl acetate) (PVAc) blends by investigating their ther mal, rheological, and mechanical properties. Two Separate glass transition temperature peaks for the BDP/PVAc blends proved that these blend systems a re immiscible. From the rheological measurement, the shear viscosity as a f unction of shear rate is observed to increase with increasing PVAc content in BDP/PVAc blends, since PVAc has a relatively high molecular weight compa red to BDP. Moreover, BDP blends with 10 wt % PVAc have excellent mechanica l properties. (C) 2000 John Wiley & Sons, Inc.