Maghnite- H+ is Algerian montmorillonite sheet alumino-silicate clay, exchanged with protons (H+). This solid non-toxic catalyst was successfully used as cationic catalyst for the polymerization of D,L-Lactid at 100°C. Interactions between Maghnite-H+ platelets and the monomer (D,L-Lactide) were studied by solid state 1H, 27Al and 29Si NMR spectroscopy. The results show that, the mechanism of the reaction involves both Brønsted and Lewis acid sites on Maghnite surface.
Keywords:
D; L-Lactide; poly (D,L-Lactide); PLA; Solid state NMR; Montmorillonite; Solid Catalyst