Experimental Overview of Standard Polycondensation and Ring Opening Polymerization Methods of PLLA

Horváth, Tibor and Marossy, Kálmán and Szabó, Tamás J. (2020) Experimental Overview of Standard Polycondensation and Ring Opening Polymerization Methods of PLLA. Materials Science and Engineering, 45 (1). pp. 143-152. ISSN 2063-6792

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Abstract

The polylactic acid (PLA) is a well-known and widely used biodegradable bi-opolymer. The PLA could be produced by standard polycondensation and ring opening polymerization (ROP) technique. Each method has special requirements in order to synthe-size polymers with appropriate properties and process efficiency. In this work both methods were applied to produce Poly-L-lactic (PLLA). During the experiments, method specific but various process parameters have been used. Regarding the ROP polymerization, a new oligomer separation method has been introduced. The base of this newly applied technique is the PLA oligomers’ solubility in acetone and subsequent precipitation in water. The ex-tracted crystal-like oligomers could be used for further polymer synthesis. The produced samples were analysed by FTIR and DSC methods to identify the structures and define the physical and chemical properties of synthetized materials. Over the polymerizations PLLA was plastified by adding of glycerol-dioleate. Based on the trials’ experiences the standard polycondensation and the ring opening processes have been compared and the effect of plasticizer was defined.

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