Manufacturing Method for Novel Polylactide/Clay Nanocomposite with Improved Shear Thinning and Tough

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PURPOSE : 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. CONSTITUTION : 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. © KIPO 2007