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Sensors 2010, 10(5), 5063-5073; doi:10.3390/s100505063
Article

Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties

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1 Faculty of Technology, University of Nis, Bulevar oslobodjenja 124, 16000 Leskovac, Serbia 2 Faculty of Technology, University of Novi Sad, Cara Lazara 1, 21000 Novi Sad, Serbia 3 Faculty for Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia
* Author to whom correspondence should be addressed.
Received: 29 March 2010 / Revised: 26 April 2010 / Accepted: 28 April 2010 / Published: 20 May 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

Poly(D,L-lactide) synthesis using tin(II) 2-ethylhexanoate initiated ring-opening polymerization (ROP) takes over 30 hours in bulk at 120 °C. The use of microwave makes the same bulk polymerization process with the same initiator much faster and energy saving, with a reaction time of about 30 minutes at 100 °C. Here, the poly(lactide) synthesis was done in a microwave reactor, using frequency of 2.45 GHz and maximal power of 150 W. The reaction temperature was controlled via infra-red system for in-bulk-measuring, and was maintained at 100 °C. Different molar ratios of monomer and initiator, [M]/[I], of 1,000, 5,000 and 10,000 were used. The achieved average molar masses for the obtained polymers (determined by gel permeation chromatography) were in the interval from 26,700 to 112,500 g/mol. The polydispersion index was from 2.436 to 3.425. For applicative purposes, the obtained material was purified during the procedure of microsphere preparation. Microspheres were obtained by spraying a fine fog of polymer (D,L-lactide) solution in tetrahydrofuran into the water solution of poly(vinyl alcohol) with intensive stirring.
Keywords: poly(D,L-lactide); novel microwave synthesis; ring-opening polymerization (ROP) poly(D,L-lactide); novel microwave synthesis; ring-opening polymerization (ROP)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Nikolic, L.; Ristic, I.; Adnadjevic, B.; Nikolic, V.; Jovanovic, J.; Stankovic, M. Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties. Sensors 2010, 10, 5063-5073.

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