Effects of UV Light Irradiation on Color Changes in Thermally Modified Rubber Wood Based on FTIR

文献类型： 外文期刊

第一作者： Li, Xiaowen

作者： Li, Xiaowen;Li, Tongtong;Li, Guanjun;Li, Min;Lu, Quanji;Qin, Shaoshan;Li, Jianing

作者机构：

关键词： Rubber wood; Thermal modification; Color; Photostability; FTIR

期刊名称：BIORESOURCES （ 影响因子：1.614； 五年影响因子：1.923 ）

ISSN： 1930-2126

年卷期： 2020 年 15 卷 3 期

页码：

收录情况： SCI

摘要： To evaluate the effects of chemical changes during thermal modification on the resistance of wood against photodegradation, heat-treated specimens of rubber wood (Hevea brasiliensis) were exposed to ultraviolet light for 384 h. The color changes in the exposed wood surfaces were analyzed using a colorimeter; the chemical changes were monitored using Fourier-transform infrared spectroscopy (FTIR). The photoweathering performances of rubber wood treated at 155 degrees C for 2 h, 155 degrees C for 6 h, and 185 degrees C for 2 h were similar to that of untreated wood, as the lignin did not undergo profound chemical transformation under mild modification conditions. However, compared to untreated rubber wood, the photoaging performances of rubber wood treated at 185 degrees C for 6 h and 215 degrees C for 2 h were notably changed. The transformation process was confirmed by FTIR. A good linear relationship between color change and lignin degradation was observed after mild, but not severe, heat treatment. The concentration of carbonyl groups in the wood specimens generally increased during photoaging, although not all samples showed a good correlation between color change and the concentration of carbonyl groups. Only the photochromic performance of wood changed notably when lignin was extensively modified under severe heat-treatment conditions.

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