INVESTIGATION OF THE STATE OF WATER IN ENERGY TREES IN THE PROCESS OF DRYING BY DIFFERENTIAL SCANNING CALORIMETRY

This paper presents the results of investigation of the state of water in young sprouts of energy trees (willow, poplar, and alder) in the process of drying to the limiting moisture content by differential scanning calorimetry. The content of freezing (free) and nonfreezing (bound) water in samples with various moisture contents has been determined. It has been shown that the specifi c content of bound water (referred to dry substance) W_b.w in the above trees in the process of their drying in the range from natural moisture to the limiting moisture content is not a constant quantity. In these trees in the state of natural moisture the W_b.w value exceeds their hygroscopicity limit, and in the process of dehydration the W_b.w value decreases. For instance, W_b.w varies from 0.419 to 0.254 g/g of dry substance for poplar, from 0.425 to 0.248 g/g of dry substance for willow, and from 0.354 g/g of dry substance for alder.
   
Author:  V. A. Mykhailyk, Yu. F. Snezhkin, and N. V. Dmitrenko