Rahmayetty, Rahmayetty and Sukirno, Sukirno and Gozan, Misri (2018) Artikel_Effect of Polycondensation Temperature to Oligomer Yield and Depolimerisation Side Reaction. World Chemical Engineering Journal, 2 (1). pp. 12-16. ISSN 2443-2261

Text 2. Effect of Polycondensation Temperature to Oligomer yield and Depolimerisation side reaction.pdf Download (956kB)

Abstract

Ring-opening polymerization reaction is the best method for producing high molecular weight polymers. The stage of manufacture of PLA from lactic acid through the lactide ring opening reaction is carried out through three stages of the process ie poly-condensation, depolymerization and polymerization. The polycondensation stage of lactic acid is the stage of oligomer formation. At the poly-condensation stage, the oligomeric molecular weight is determined by the temperature, pressure, type and concentration of the catalyst used. The purpose of this research was to obtain the effect of poly-condensation temperature without catalyst on oligomer recovery and side reactions of depolymerization. Poly-condensation is done by pretreatment of lactic acid at 120oC for 1 hour. After that, the heating lactic acid at varying temperature. OLLA yield at poly-condensation temperature 150; 180; 200oC for 4 h and gradually (at 150 oC for 2 h and 180oC for 2 h) were 96.33; 85.36; 82.13 and 88.37% respectively. The higher poly-condensation temperature, the intramolecular interactions of the molecule as a side reaction was increasing.

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