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Linseed oil and mixture with maleic anhydride: 1 H and 13 C NMR
Author(s) -
SolladiéCavallo A.,
Senouci H.,
Jierry L.,
Klein A.,
Bouquey M.,
Terrisse J.
Publication year - 2003
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-003-0695-z
Subject(s) - maleic anhydride , linseed oil , chemistry , exothermic reaction , solvent , oleic acid , carbon 13 nmr , linoleic acid , organic chemistry , nuclear chemistry , polymer , copolymer , fatty acid , biochemistry
Abstract It was shown that 1 H NMR allowed a rapid determination of the ratio of the linolenic residues over all the others (linoleic + oleic + saturated) and 13 C NMR allowed a rapid determination of the ratio of linolenic over (linoleic + oleic) residues as well as the linoleic/oleic ratio in a few minutes on less than 20 mg of crude LO. After thermal treatment (220°C for 2 h, followed by cooling to room temperature), a 1∶1 mixture of linseed oil (LO) and maleic anhydride (MA), which was a suspension, became limpid and remained limpid. Moreover, the viscosity of the mixture was higher than that of pure LO treated in the same way. It was shown by 13 C NMR and quantitative recovery of the constituents (LO and MA) through solvent separation that no reaction occurred between LO and MA during this thermal treatment. This result is in accord with DSC analysis of such a 1∶1 LO/MA mixture that exhibited an exothermic effect too small (about 34 kcal/mol) to correspond to formation of a C−C bond.