Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties
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 minute...
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| Format: | Article |
| Language: | English |
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MDPI AG
2010-05-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/10/5/5063/ |
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| author | Ljubisa Nikolic Ivan Ristic Borivoj Adnadjevic Vesna Nikolic Jelena Jovanovic Mihajlo Stankovic |
| author_facet | Ljubisa Nikolic Ivan Ristic Borivoj Adnadjevic Vesna Nikolic Jelena Jovanovic Mihajlo Stankovic |
| author_sort | Ljubisa Nikolic |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T08:40:19Z |
| format | Article |
| id | doaj.art-ad1642b4edef4bdaae8431abcb109878 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T08:40:19Z |
| publishDate | 2010-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-ad1642b4edef4bdaae8431abcb1098782022-12-22T02:53:56ZengMDPI AGSensors1424-82202010-05-011055063507310.3390/s100505063Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product PropertiesLjubisa NikolicIvan RisticBorivoj AdnadjevicVesna NikolicJelena JovanovicMihajlo StankovicPoly(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.http://www.mdpi.com/1424-8220/10/5/5063/poly(D,L-lactide)novel microwave synthesisring-opening polymerization (ROP) |
| spellingShingle | Ljubisa Nikolic Ivan Ristic Borivoj Adnadjevic Vesna Nikolic Jelena Jovanovic Mihajlo Stankovic Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties Sensors poly(D,L-lactide) novel microwave synthesis ring-opening polymerization (ROP) |
| title | Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties |
| title_full | Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties |
| title_fullStr | Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties |
| title_full_unstemmed | Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties |
| title_short | Novel Microwave-Assisted Synthesis of Poly(D,L-lactide): The Influence of Monomer/Initiator Molar Ratio on the Product Properties |
| title_sort | novel microwave assisted synthesis of poly d l lactide the influence of monomer initiator molar ratio on the product properties |
| topic | poly(D,L-lactide) novel microwave synthesis ring-opening polymerization (ROP) |
| url | http://www.mdpi.com/1424-8220/10/5/5063/ |
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