The Effect of the Impurities in Refinery Process from Fermentation Broth on Lactic Acid Polymerization
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概要
- 論文の詳細を見る
Polylactic acid (PLA) is synthesized by direct polycondensation without catalyst (NC-DP) method using a lactic acid (HLa) solution which had been refined by concentration, esterification and hydrolysis of fermented broth from fresh cassava roots (FCR). Higher polymerization rates and earlier thermal degradation had been observed, compared with those from a pure lactic acid solution. It is due to residual impurities in refining process, such as butanol (BuOH) and butyl lactate (BuLa), which act as an external catalyst. Additionally, it has been found that thermal degradation of PLA containing these impurities occurs via random scission with vinyl end groups, in regard to specific scission for PLA from a pure HLa solution.
著者
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ACHMAD Feerzet
Department of Chemical Engineering, Tokyo University of Agriculture and Technology
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KOKUGAN Takao
Department of Chemical Engineering, Tokyo University of Agriculture and Technology
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LIU Zhi
Department of Chemistry, Wuhan University
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YAMANISHI Keisuke
Department of Applied Chemistry, Science and Engineering, Waseda University
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