MANUFACTURING METHOD FOR NOVEL POLYLACTIDE/CLAY NANOCOMPOSITE WITH IMPROVED SHEAR THINNING AND TOUGHNESS

摘要

Provided is a method for preparing a novel polylactide/clay nanocomposite which is improved in shear thinning and toughness by enhancing a plasticization effect and can be applied to a biodegradable resin of polylactide. The method comprises the steps of pretreating a clay having a hydroxyl group at surface with a ring opening polymerization catalyst; adding a lactide-based monomer and a caprolactone-based monomer to the pretreated clay and increasing the reaction system to carry out the surface modification reaction of the clay; and melt mixing the obtained clay with a polylactide having a number average molecular weight of 50,000 or more to prepare a polylactide/clay nanocomposite. Preferably the ring opening polymerization catalyst is at least one organometallic catalyst of Sn, Al or rare earth elements.