2Woo S I, Kim B O. Polymerization of aqueous lactic acid to prepare high molecular weight poly(lactic acid)by chain extending with hexamethylene diisocyanate[J]. Polym Bu11,1995,35(4) :415 -425.
3Srikanth P, Adam K, Liqiang Y. Microcellular injection-molding of polylactide with chain-extender[ J ]. Materials Science and Engineering C ,2009,29 : 1258 - 1265.
4Kim H S,Park B H ,Choi J H,ct al. Mechanical properties and thermal stability of poly (L-lactide)/Calcium carbonate composites [ J ]. Journal of Applied Polymer Science ,2008,109:3087 - 3092.