Chen Yao, Stark Nicole M, Tshabalala Mandla A, Gao Jianmin, Fan Yongming
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China.
U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI 53726-2398, USA.
Materials (Basel). 2016 Jul 23;9(8):610. doi: 10.3390/ma9080610.
This study investigated weathering performance of an HDPE wood plastic composite reinforced with extracted or delignified wood flour (WF). The wood flour was pre-extracted with three different solvents, toluene/ethanol (TE), acetone/water (AW), and hot water (HW), or sodium chlorite/acetic acid. The spectral properties of the composites before and after artificial weathering under accelerated conditions were characterized by Fourier transform infrared (FTIR) spectroscopy, the surface color parameters were analyzed using colorimetry, and the mechanical properties were determined by a flexural test. Weathering of WPC resulted in a surface lightening and a decrease in wood index (wood/HDPE) and flexural strength. WPCs that were reinforced with delignified wood flour showed higher ΔL and ΔE values, together with lower MOE and MOR retention ratios upon weathering when compared to those with non-extracted control and extracted WF.
本研究调查了用萃取或脱木质素木粉(WF)增强的高密度聚乙烯(HDPE)木塑复合材料的耐候性能。木粉先用三种不同的溶剂进行预萃取,即甲苯/乙醇(TE)、丙酮/水(AW)和热水(HW),或用亚氯酸钠/乙酸进行处理。通过傅里叶变换红外(FTIR)光谱对加速条件下人工老化前后复合材料的光谱特性进行表征,使用比色法分析表面颜色参数,并通过弯曲试验测定力学性能。木塑复合材料的老化导致表面变浅,木材指数(木材/HDPE)和弯曲强度降低。与未萃取的对照样和萃取木粉增强的木塑复合材料相比,用脱木质素木粉增强的木塑复合材料在老化时表现出更高的ΔL和ΔE值,以及更低的弹性模量(MOE)和抗弯强度保留率。