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- W2013604434 abstract "Abstract Epoxidized oils, epoxidized triacylglycerols, and epoxidized fatty acid methyl esters were made by reaction with performic acid formed in situ . The extent of epoxidation was ca. 95% for all of the epoxidized samples, as determined by 1 H nuclear magnetic resonance. The epoxidized samples were reacted with an excess of acrylic acid for different reaction times. The acrylation reaction was found to have a first‐order dependence on the epoxide concentration for all oils, pure triacylglycerols, and fatty acid methyl esters. However, the rate constant of acrylation was found to depend on the composition of the epoxidized material. The acrylation rate constant for 9,10‐epoxystearic acid was 96 L 2 /(mol 2 ·min). The rate constant of acrylation for the epoxides on 9,10,12,13‐diepoxystearic acid was 60 L 2 /(mol 2 ·min). The acrylation rate constant for the epoxides on 9,10,12,13,15,16‐triepoxystearic acid was 50 L 2 /(mol 2 ·min). Thus, the rate constant of acrylation increased as the number of epoxides per fotty acid decreased. Multiple epoxides per fatty acid decrease the reactivity of the epoxides because of steric hindrance effects, and the oxonium ion, formed as an intermediate during the epoxyacrylic acid reaction, is stabilized by local epoxide groups. These results were used to derive an acrylation kinetic model that predicts rate constants from fatty acid distributions in the oil. The predictions of the model closely match the experimentally determined rate constants." @default.
- W2013604434 created "2016-06-24" @default.
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- W2013604434 date "2002-01-01" @default.
- W2013604434 modified "2023-09-29" @default.
- W2013604434 title "The effect of fatty acid composition on the acrylation kinetics of epoxidized triacylglycerols" @default.
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- W2013604434 doi "https://doi.org/10.1007/s11746-002-0435-4" @default.
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