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A study of fatty acid methyl esters with epoxy or alkyne functionalities
KTH, Tidigare Institutioner (före 2005), Polymerteknologi.ORCID-id: 0000-0003-3201-5138
2001 (Engelska)Ingår i: Journal of the American Oil Chemists Society, ISSN 0003-021X, E-ISSN 1558-9331, Vol. 78, nr 12, s. 1191-1196Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Described are the physical and chemical properties of the methyl esters of two uncommon fatty acids: vernolic acid, containing an epoxy group, and crepenynic acid, containing a triple bond. The incorporation of an epoxy or alkyne group into the fatty acid structure is shown to greatly affect the properties compared to conventional unsaturated fatty acids, The methyl esters have been characterized and compared with ordinary fatty acid methyl esters (i.e., methyl oleate and linoleate) with respect to spectroscopic characterization [H-1 nuclear magnetic resonance (NMR)], C-13 NMR, and Fourier transform infrared), rheological properties, and oxidative reactivity (using chemiluminescence), Both methyl vernoleate and methyl crepenynate could successfully be produced by transesterification under basic conditions without reaction of the epoxy or alkyne groups. Rheological measurements showed that the methyl esters had a significantly lower viscosity compared to their triglyceride analogs. Smaller differences were seen when comparing the different methyl esters where methyl vernoleate had the highest viscosity due to the presence of the more polar oxirane group. Very large differences were found with respect to the oxidation rate of the different methyl esters. Methyl crepenynate was shown to oxidize extremely rapidly, whereas methyl vernoleate was very stable toward oxidation.

Ort, förlag, år, upplaga, sidor
2001. Vol. 78, nr 12, s. 1191-1196
Nyckelord [en]
alkyne, characterization, chemiluminescence, crepenynic acid, epoxy, methyl esters, NMR, oxidation, vernolic acid, viscosity, vegetable-oils, coatings
Identifikatorer
URN: urn:nbn:se:kth:diva-21235DOI: 10.1007/s11745-001-0412-yISI: 000173121200004Scopus ID: 2-s2.0-0035718632OAI: oai:DiVA.org:kth-21235DiVA, id: diva2:339933
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QC 20100525Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2022-06-25Bibliografiskt granskad

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Johansson, Mats K. G.

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Totalt: 162 träffar
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