Abstract
Soybean oil was heated at 180°C for 10 to 40 hrs. under the constant airration. Flow properties were measured by Malon-Belner type capillary viscometer, and the fatty acids which are obtained by sponification of the heated oil were separated by silica-gel culumn chromatography. The flow property, the viscosity, and the chromatographic fractions F1, F2, F3 which are suggested as monomer, dimer and trimer did not change violently up to 20 hrs. of heating. However, for 30 hrs. of heating, the flow property, the viscosity and ether soluble fraction F4 which are expected to be the polymer of fatty acid were significantly hanged. From the above results, it may be said that the changes of the flow property and the viscosity of oils were effected by the polymerization of fatty acid.
