| Solvent-free acid-catalyzed ring opening of epoxidized oleochemicals using stearates/stearic acid, and its applications. | |
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MedLine Citation:
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PMID: 22304525 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Toxic solvent and strong acid-catalysts causing environmental issues have been mainly used for ring opening of the epoxidized oleochemicals. Here, we demonstrated that magnesium stearate (Mg-stearate) was a high efficient catalyst for solvent-free ring opening of epoxidized methyl oleate, a model compound of mid-chain epoxide. Mg-stearate resulted in the highest yield (95%) and conversion rate (99%) toward mid-chain alkoxyesters at the same condition (160˚C, 12 h) superior to other fatty acid derivatives such as a Lewis acid (lithium and sodium stearate) and Brønsted acid (stearic acid). Based on this chemical study, we synthesized biogrease and thermoplastic using epoxidized soybean oil (ESO) and Mg-stearate via one-pot, solvent-free, and purification-free process. Mg-stearate played a significant role as a reactant for epoxide ring-opening and as a thickener when excess loading rate was used; viscosity increased from 1800 to 4500 Pa.s at 25 °C when ESO:Mg-stearate increased from 1:1 equiv to 1:2, then behaved like thermoplastics (Tg= -27 °C, Tm =90 °C) with 1:4. |
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Authors:
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Byung-Jun Kollbe Ahn; Stefan Kraft; Xiuzhi Susan Sun |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-3 |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: - ISSN: 1520-5118 ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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