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Biodegradable polymeric materials derived from renewable resources have attracted tremendous attention in different application. Polylactic acid (PLA) is one of the most useful biodegradable polymers. It is difficult to synthesize high molecular weight polylactic acid by direct polycondensation. The present work describes the synthesis of high molecular weight PLA by varying the duration of reaction and changing the sequence of catalyst addition. Binary catalyst used was SnCl2.2H2O/maleic anhydride and p-toluene sulfonic acid. PLA with molecular weight (6.503X105) was obtained in 52 hours. FTIR, 1H and 13C NMR ascertained the structure of synthesized PLA whereas GPC was used for determining molecular weight. Keyword: Polylactic acid synthesis, Characterization by FTIR, 1H NMR, 13C-NMR, GPC.

High Molecular Weight Poly(lactic acid) Synthesized with Apposite Catalytic Combination and Longer time