DIELECTRIC-RELAXATION OF WATER ADSORBED ON WOOD .2.

To clarify the mechanism of the dielectric relaxation of the water ads orbed on wood, dielectric measurements of trityl and acetyl celluloses as well as cellulose containing various amounts of water were made. T wo relaxations due to the adsorbed water for trityl and acetyl cellulo ses were observed, but only one relaxation for cellulose. However, the dielectric behavior of cellulose at a relative humidity less than abo ut 60% was very different from that at a relative humisity of more tha n 60%. Thus it was considered that two relaxations due to adsorbed wat er existed in cellulose. These two relaxations for cellulose had close resemblances in characteristics to those for trityl and acetyl cellul oses. It is supposed that the relaxation of the adsorbed water for cel lulose at the smaller relative humidity resulted from the reorientatio n of one water molecule accompanied by the scission of about two hydro gen bonds, whereas that at the greater relative humidity resulted from the simultaneous reorientation of plural water molecules.