6Traore M K, Buschle - Diller G. Environmentally Friendly Scou ring Processes [ J ]. Textile Chemist and Colorist and American Dyestuff Reporter ,2000,32 ( 12 ) :40 - 43
7Kricheldorf H R. Syntheses and Application of Polylactides[ J ]. Chemophere ,2001,43:49 - 54
8Ajioka M, Enomoto K, YamaguchiA. Basic Properties of Polylactic Acid Produced by the Direct Condensation Polymerization of Lactic Acid[J]. Bull Chem Soc Jpn,1995, (68) :2125 -2131
9Otera J, Kawada K, Yano T. Direct Condensation Polymerization of L - lactic Acid by Distannoxane [ J ]. Chem Lett, 1996, ( 3 ) :225 - 226
10Akutsu F,Inoki M, Uei H, Sueyoshi M, et al. Synthesis of Poly (lactic acid) by Direct Polycondensation of Lactic Acid Using 1,1 ' - Carbonyldiimidazole, N, N, N' , N' - Tetramethylchlorofonn - Amidinium Chloride, and N, N' - Dicyclohexylcarbodiimide as Condensing Agents [ J ]. Polym J, 1998,30 ( 5 ) :421 -423