(1) The static friction coefficients of glass surfaces covered with the mono- and multi-molecular layers of some long chain acids etc. have been measured. (2) The friction coefficients of glass covered with monomolecular film of acids are about one tenth of that of clean glass. The friction coefficients of alcohols and esters are somewhat higher but fluctuate considerably. (3) The friction coefficients of multimolecular layers decrease by the increase of their thickness until it becomes five or seven molecular layers, but shows no further reduction. (4) The effect of compression during the deposition of the film was investigated. The film deposited in high compression state shows low friction coefficient. (5) The film deposited from basic substrate shows lower friction coefficient than that deposited from acidic substrate. (6) The force area relations of stearic acid monolayer have been studied on fresh distilled water, on tap water, and on tap water added with ammonium oxalate in relation to the transference of the film on the glass plate.
The molecular weights of polymerised tung oils were measured in the solution of benezne, camphor, nitrobenzene, bromoform, ethylene bromide by the cryoscopic method. By the camphor method reasonable molecular weights were obtained. But in benzene the molecular weight decreases rapidly with the increasing concentration. In nitrobenzene, ethylene bromide, bromoform the molecular weight behaves as linear function of concentration and the rate of decrease in molecular weight with increasing concentration is not so eminent as in benzene. On the contrary in cyclohexane the molecular weight increases with the increasing concentration and reasonable values are obtained by extrapolation. The abnormality in benzene may be considered as the solvation action.
The free triethyltin groups prepared by two methods, namely, the reduction of (C2H5)3SnX and the oxidation of (C2H5)2SnNa or ((C2H5)2SnNa)2 appear to be identical. However, their rate of oxidation appears to differs markedly from one another. It is assumed that this is due to their electronic constitutional difference (electroisomeric) or in the methods of preparation.