Synthesis and Characterization of Star-shaped polylactic acid with polyhedral oligomeric silsesquioxanes

摘要

A series of star-shaped polylactic acid was synthesized using L-lactic acid (L-LA) and octa(γ-chloroammoniumpropyl) octasilsesquioxane (POSS-NH_3Cl) by in the presence of stannous(II) octanoate (Sn(Otc)_2) catalyst. The structures and properties of these dendritic polymers were characterized by FTIR, ~1H-NMR and TGA, respectively. These results demonstrated that the chemical reaction between POSS-NH_3Cl and L-LA had been taken place, and the novel star-shaped polylactic acid (POSS-g-PLLA) had been synthesized. And thermal properties, such as melting temperature and decomposition temperature, were obviously improved along with the increment of the added amount of POSS-NH_3Cl. The decomposition temperature of POSS-g-PLLA was higher ca. 70°C higher than that of PLLA, also higher 65°C than that of POSS-NH_3Cl/PLLA.