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    STUDIA CHEMIA - Issue no. 2 / 2011  
         
  Article:   SYNTHESIS OF POLY(L-LACTIC ACID) BY DIRECT POLYCONDENSATION.

Authors:  OANA CADAR, SERGIU CADAR, MARIN ŞENILĂ, CORNELIA MAJDIK, CECILIA ROMAN. 		 
       
         
  Abstract:  Poy (lactic acid), a biodegradable polymer, has been extensively studied during last 15 years due to its wide range of applications. In this study, the synthesis of the poly (L-lactic) acid) with appropriate molecular weight for medical applications was investigated. Stanous(II) chloride was used as catalyst in a quantity of 0.25 wt% calculated on the monomer. Polycondensation was carried out over a period of 72 h, using xylene as solvent. The identification and purity of the obtained polymer was assessed by NMR spectroscopy. The molecular weight of PLA was measured by the intrinsic viscosity method.

Keywords: lactic acid, catalysis, direct polycondensation. 

 
         
     
         
         
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