Spectroscopic Analysis of the Influences of Extractives on Heat-induced Discoloration of Black Locust (Robinia pseudoacacia)
The presence of extractives has been known to play an important role in the wood discoloration. The chromophoric parameters and chemical changes of the Black Locust (Robinia pseudoacacia) wood after heat treatment at the condition of 120℃ for 24h have been examined through DRUV and FTIR-ATR spectra. The comparison of color changes on reference and extractive free wood meal showed that the extractives could be attributed to most of the color variations of wood as involving considerable changes of conjugation chromophores. The L* increased and the b* values decreased after the removal of the extractives. The total color difference (ΔE*) was higher for reference (24.52) than that of extractive free specimen (20.23) when it was subjected to heat treatment. The DRUV spectrum of the original specimen exhibits a stronger and wider absorption band than that of extractive free after heat treatment. Phenol substances in extractives could be readily oxidized to quinones structures, and the conjugated carbonyl groups and double bonds were also increased during heat treatment.
heat treatment discoloration extractives UV-Vis FTIR-ATR Robinia pseudoacacia
Yao CHEN Yong-ming FAN Jian-min GAO
College of Material Science and Technology, Beijing Forestry University, Beijing, 100083, P.R.China
国际会议
南京
英文
831-836
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）