Ultrasound assisted lipase catalyzed synthesis of poly-6-hydroxyhexanoate
Ultrasonic irradiation greatly improved the Candida antarctica lipase B mediated ring opening polymerization of e-caprolactone to poly-6-hydroxyhexanoate in the ionic liquid 1-ethyl-3-methylimidazolium tetraflouroborate. Compared to the conventional nonsonicated reaction, sonication improved the mo...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Elsevier
2012
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/9634/1/00013161_103469.pdf http://eprints.um.edu.my/9634/ |
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| Summary: | Ultrasonic irradiation greatly improved the Candida antarctica lipase B mediated ring opening polymerization
of e-caprolactone to poly-6-hydroxyhexanoate in the ionic liquid 1-ethyl-3-methylimidazolium tetraflouroborate. Compared to the conventional nonsonicated reaction, sonication improved the monomer conversion by 63% and afforded a polymer product of a narrower molecular weight distribution and a higher degree of crystallinity. Under sonication, the polydispersity index of the product was 1.44 compared to a value of 2.55 for the product of the conventional reaction. With sonication, nearly 75% of the
monomer was converted to product, but the conversion was only 16% for the reaction carried out conventionally.
Compared to conventional operation, sonication enhanced the rate of polymer propagation by >2-fold and the turnover number of the lipase by >3-fold. |
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