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Title: | Novel microwave-assisted synthesis of poly(D,L-lactide): the influence of monomer/initiator molar ratio on the product properties | Authors: | Nikolic, Ljubisa Ristic, Ivan Adnađević, Borivoj Nikolic, Vesna Jovanovic, Jelena Stankovic, Mihajlo |
Keywords: | novel microwave synthesis;poly(D,L-lactide);ring-opening polymerization (ROP) | Issue Date: | 2010 | Journal: | Sensors (Basel, Switzerland) | 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. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/1470 | ISSN: | 1424-8220 | DOI: | 10.3390/s100505063 |
Appears in Collections: | Journal Article |
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