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https://open.uns.ac.rs/handle/123456789/11660
Title: | Novel microwave-assisted synthesis of poly(D,L-lactide): The influence of monomer/initiator molar ratio on the product properties | Authors: | Nikolić, Ljubiša Ristić, Ivan Adnađević, Borivoj Nikolić, Vesna Jovanović, Jelena Stanković, Mihajlo |
Issue Date: | 20-May-2010 | Publisher: | MDPI | Journal: | Sensors | 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. © 2010 by the authors; licensee MDPI, Basel, Switzerland. | URI: | https://open.uns.ac.rs/handle/123456789/11660 | ISSN: | 14248220 | DOI: | 10.3390/s100505063 |
Appears in Collections: | TF Publikacije/Publications |
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