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Preparation of Poly(lactic acid) by Melt Polycondensation and Its Reaction Kinetics

TIAN Hui,CHEN Yun,WANG Jie(Department of Materials Science and Engineering,Beijing Institute of Clothing Technology,Beijing 100029,China)  
Poly(lactic acid) was prepared directly by melt polycondensation.The influence of the catalysts kinds,reaction time and the temperature were studied.Results showed that the preferable experimental conditions were as follows: the temperature was 180?℃,the pressure was less than 100?Pa,the catalyst was TSA.Reaction kinetics at 170?℃ and 180?℃ were also studied.The result showed that the process of melt polycondensation of lactic acid was a second order reaction.
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