Gumel AM, Annuar MSM, Chisti Y, Heidelberg T. Ultrasound assisted lipase catalyzed synthesis of poly-6-hydroxyhexanoate.
ULTRASONICS SONOCHEMISTRY 2012;
19:659-667. [PMID:
22105013 DOI:
10.1016/j.ultsonch.2011.10.016]
[Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 10/24/2011] [Accepted: 10/27/2011] [Indexed: 05/31/2023]
Abstract
Ultrasonic irradiation greatly improved the Candida antarctica lipase B mediated ring opening polymerization of ε-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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