Poly (Lactic acid) Synthesis through Polycondensation Method and Optimized Reaction Time

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Farzad, Ashkan | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39531 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Frounchi, Masoud; Dadbin, Sousan
Abstract:
Poly (Lacticacid) belongs to the family of aliphatic polyesters. PLA can be made from annually renewable resources to yield articles for use in either the industrial packaging field or the biocompatible /bioabsorbable medical device market. Production of PLA through polycondensation in an industrial way was the aim of this project. In order to have the appropriate reaction conditions a steel reactor was designed and constructed. Feasibilty of PLA production in the constructed reactor was investigated and the product was analyzed, using H-NMR and FT-IR spectrum analysis. The average molecular weight was measured by GPC and ubbelohde viscometery method. Studies have shown that oligomerization time and polycondensation time have larg effect on the final average molecular weight. These reaction times were optimized, using CCD method and MiniTab 15 computer program. Additional experiments were carried out respecting the optimized reaction times and using different ways of adding the catalyst. Finally the average molecular weight of 38000 was achieved. It is worth noting that we enquired into this method for the first time in Iran
Keywords:
Polycondensation ; Biodegradable Polymer ; Optimization ; Reaction Time ; Polylactic Acid

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