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International Journal of Polymer Science
Volume 2016, Article ID 2454610, 8 pages
http://dx.doi.org/10.1155/2016/2454610
Research Article

Moisture Sorption and Thermodynamic Properties of Wood under Dynamic Condition

College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China

Received 30 September 2014; Accepted 13 December 2014

Academic Editor: Cornelia Vasile

Copyright © 2016 Tiantian Yang and Erni Ma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thermodynamic approach is a useful method to study interactions between water and wood at molecular level. This work investigated the dynamic moisture sorption and thermodynamic properties for two thick poplar woods (Populus euramericana Cv.) subjected to sinusoidal relative humidity (RH) changes between 45% and 75% for cyclic period of 1, 6, and 24 h, at two temperatures of 25°C and 40°C. Moisture changes of the specimens were measured during the successive adsorption and desorption processes, giving the following results: (1) moisture content changed sinusoidally with the imposed RH and was inversely related to specimen thickness as well as temperature, but in a positive correlation with cyclic periods; (2) all of , , and of the adsorbed water during dynamic sorption decreased with increasing moisture content or specimen thickness and decreasing cyclic period. However, temperature had opposite effects on and . (3) Both moisture sorption hysteresis and thermodynamic sorption hysteresis could be found. The former became weak with rising temperature or thicker specimens, while the latter got clear when temperature or specimen thickness increased.