Development of amorphous PLA-montmorillonite nanocomposites

摘要: The large amounts of plastics that are produced mainly from fossil fuels, once they consumed and discarded into the environment, finally end up as undegradable wastes, therefore contribute greatly to global pollution. For this reason, there is an urgent need produce renewable source-based environmentally benign plastic materials, specially in short term packaging disposable applications could allow composting naturally occurring degradation products. One most promising candidates direction poly(lactic acid) (PLA), resources readily biodegradable. PLA a linear thermoplastic polyester by ringopening polymerization lactide. Lactide cyclic dimmer prepared controlled depolymerization lactic acid, which obtained fermentation sugar feedstocks, corn, etc. [1, 2]. In general commercial grades copolymers poly(L-lactic poly(D,L-lactic acid), L-lactides D,L-lactides respectively. ratio L-enantiomers D,L-enantiomers known affect properties [3], i.e. if materials semicrystalline or amorphous; until now all efforts reported order improve focused on material e.g. D-content less than 6%. There increasing interest using for degradable articles; however, such flexural properties, gas permeability, impact strength, processability, often not good enough some use [4]. On other hand confinement polymer two-dimensional silicate gallery, so-called nanocomposite, one effective ways performance [5]. widely utilized clay montmorillonite (MMT) its cation exchange capacity Ogata et al. [4] first