TAN Zhili, ZHANG Liqiang, WU Qingding, YUAN Jian, LONG Zhizhong

(College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410004，China)

Abstract: Influences of temperature on surface color and chemical composition of poplar flour formed by warm compaction were investigated by CIE(1976)L*a*b* system and fourier transform infrared spectroscopy(FTIR). The results show that the surface color darkens with the forming temperature increasing. Brightness value varies from 37.5% to 79.2%, red-green product index ranges from 53.8% to 207.7% and yellow-blue product index ranges from 22.4% to 110.3%. The difference of ΔE* is 1.1 when forming temperature is between 180 ℃ and 200 ℃. When temperature is below 180 ℃, its influence on poplar flour is more obvious. Softening of cellulose and lignin begins with the increasing temperature and results in the surface color of the specimen darkened. The degradation of cellulose and lignin happens mainly in the side chain. Degree of hemicellulose degradation in the specimen is stronger than that of cellulose and lignin.

Keywords: poplar powder；warm compaction；surface color

中图分类号：S781.6                              文献标志码：A

文章编号：1008-5548(2019)04-0076-05

DOI:10.13732/j.issn.1008-5548.2019.04.011

收稿日期： 2018-11-26，修回日期：2019-01-16，在线出版时间：2019-01-18 08:45。

基金项目：湖南省自然科学基金项目，编号：2018JJ2681；湖南省工业领域重点研发计划项目，编号：2017GK2255；湖南省自然科学基金/

常德市联合基金项目，编号：2016JJ5009；湖南省高校科技创新团队支持计划。

第一作者简介：谭知理(1994—)，女，硕士研究生，研究方向为木质粉末材料。E-mail：987188220@qq.com。

通信作者简介：张立强(1978—)，男，博士，副教授，硕士生导师，研究方向为木质粉末材料，金属材料成形。E-mail：21384881@qq.com。