التفاصيل البيبلوغرافية
| العنوان: |
Moisture Sorption and Hygroexpansion of Paraffin Wax Emulsion-Treated Southern Pine (Pinus spp.) under Dynamic Conditions. |
| المؤلفون: |
Chau, ThiThanh chauthithanh@huaf.edu.vn, Ma, Erni maerni@bjfu.edu.cn, Yang, Tiantian bjfu100514327@163.com, Cao, Jinzhen caoj@bjfu.edu.cn |
| المصدر: |
Forest Products Journal. 2017, Vol. 67 Issue 7, p463-470. 8p. |
| مصطلحات موضوعية: |
SORPTION, SOUTHERN pines, PARAFFIN wax, HUMIDITY, MOISTURE |
| مستخلص: |
Moisture sorption and hygroexpansion of southern pine (Pinus spp.) treated with 0.5, 1, and 2 percent concentrations of paraffin wax emulsion (PWE) under dynamic conditions were investigated. The specimens, 4 and 10 mm along the grain and 20 mm in radial and tangential directions, were exposed to sinusoidal relative humidity (RH) between 45 and 75 percent at 30°C for cyclic periods of 1, 6, and 24 hours, respectively. Moisture changes and lateral dimensional changes were measured during the cycling. The moisture and dimensional responses of the specimens varied sinusoidally as well. The amplitude of moisture and the moisture sorption coefficient decreased with increasing PWE concentration treatment, leading to moisture-repellent effectiveness (MRE) values ranging from 10 to 66 percent. The list of amplitudes of dimensional change and the humidity expansion coefficient were lower in the PWE-treated wood, reflecting the antideformation effectiveness (ADE) of PWE treatment. Moisture and lateral dimension changes lagged behind RH, and the phase lag increased with an increase in PWE concentration, indicating that PWE treatment had efficient effects not only on reducing the amount but also on slowing the rate of the sorptive and hygroexpansive behavior of wood. Notably, values of MRE and ADE herein were greater than those obtained under static conditions by a previous study, i.e., PWE presented better moisture repellency and dimensional stabilizing performance of wood in dynamic environments for more practical applications. [ABSTRACT FROM AUTHOR] |
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