Polymerization of DL Lactide induced by Protonated Montmorillonite clay as a solid catalyst: Mechanism study
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 100degC. 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 Bronsted and Lewis acid sites on Maghnite surface.