Effect of anhydride type on structure and thermal properties of poly(propylene carbonate) composites produced by reactive extrusion

摘要

Poly(propylene carbonate) (PPC) is an environmental friendly thermoplastic aliphatic polycarbonate. To broaden the application of this material, three types of anhydride (maleic anhydride (MA), phthalic anhydride (PA) and pyromellitic dianhydride (PMDA)) were melt blending to end-cap PPC by reactive extrusion. FTIR, Raman spectroscopy, TGA, and intrinsic viscosity test were used to characterize structure and properties of anhydride end-capped PPC. Results indicate that the reaction mechanism between PPC with MA was different from PPC with PA and PMDA. Intrinsic viscosity test demonstrates that molecular weight of PPC-PMDA was higher than that of pure PPC. In addition, TGA results show that the thermal degradation temperature of PPC could be improved by adding three types of anhydride, and the T-5% of PPC-PMDA was the highest and increased by 26.3 oC.