Physik

Ohne Zusammenfassung     

A further study on the composition of American tung oil with special reference to the linoleic acid content

The complete separation of elaeostearic acid from linoleic acid by the irradiation and crystallization of tung oil fatty acids was found difficult if not impossible. The application of several cold alkaline permanganate oxidation procedures to samples of tung oil fatty acids indicated the presence of less than one per cent of linoleic acid in tung oil. A study of the reaction of maleic anhydride with alpha elaeostearic, beta elaeostearic acid, and with the alpha elaeostearic acid glyceride present in tung oil showed that this reagent does not react with them quantitatively but only to 86.6 per cent of the theoretical amount. It was found that the elaeostearic acid content of a tung oil can be calculated by dividing its diene value by 78.4, the determined diene value of pure alpha elaeostearic acid. In this way it was calculated that two samples of American tung oil contained 85.5 and 89.4 per cent of elaeostearic acid. It was found that alpha elaeostearic acid and the mixed fatty acids from tung oil when exposed to the air quickly underwent a change to form an extremely sticky material whose use as an adhesive for insecticides will probably soon be determined.     

Die Herstellung von Wäscheklammern

Ohne Zusammenfassung VDI