Hitoshi Hata

Study on the fundamental molecular structures of synthetic traction fluids: Part 2

It is essential to obtain guidelines for molecular design through analysing quantitatively the correlation between molecular structures and traction coefficients of traction fluids for developing an excellent traction fluid with a high traction coefficient. Although it is well known that the hydrogenation of an aromatic compound greatly increases its traction coefficient there are few accounts explaining the reason. We have analysed the influence of the intermolecular force on traction, examined why aromatic and chlorinated compounds have low traction coefficients and obtained the following results. (1) Alicyclic compounds have high traction coefficients because they interlock with each other well under high pressure. (2) Aromatic compounds have low traction coefficients because it is difficult for them to get close to each other due to repulsion of π-electrons and they have little unevenness for interlocking. (3) Chlorocyclohexane has a low traction coefficient due to the repulsion of large chlorine atoms which have a negative charge. (4) The traction property is greatly influenced by intermolecular force and molecular size, and the influence of the molecular stiffness is even smaller.

Molecular structures of traction fluids in relation to traction properties

In order to develop excellent traction fluids, guidelines for molecular design were studied through analyzing correlation between molecular structures and traction properties of traction fluids quantitatively. Some results among various simple compounds as model compounds of traction fluids and among various traction fluids were described in this article.