Surface Characteristics of modified Poplar Wood-Flour and its Effect on the Mechanical Properties of Wood Polymer Composites
In order to characterize properties of wood-flour (WF) and to elucidate their effects on the mechanical properties of wood polymer composites (WPCs), the surface functional groups of WF were investigated with Fourier transform infrared spectroscopy (FT-IR), the contact angles of different liquids against poplar wood-flour were measured with capillary rise methods based on Washburn equation before and after the modification with 4% maleic anhydride, the surface free energy and the correspondent dispersive and polar components were calculated through the methodology suggested by Owens-wendt-Kaelble, the tensile strength and flexural strength of the WPC samples produced with the modified WF (the ratio of wood-flour to high-density polyethylene (HDPE) is 60:40) were tested and the fracture surfaces of WPC samples were analyzed with scanning electron microscopy (SEM). The results showed that there was a reduction in absorbance of hydroxyl groups after the modification; the surface free energy of WF increased from 23.43mJ/m2 to 48.31 mJ/m2, which was higher than the surface free energy of HDPE (31.2mJ/m2), and its correspondent polar component decreased from 18.79 mJ/m2 to 0.4 mJ/m2 and the dispersive component increased from 4.64 mJ/m2 to 47.91 mJ/m2 after the modification with 4% maleic anhydride, which made it ready for the spreading of HDPE on the surface of WF. The tensile strength and flexural strength of the WPC samples were obviously improved due to the modification. The improved compatibility between WF and HDPE was well confirmed by the scanning electron microscopy (SEM).
Chao-Qun Mei Yong-Ming Fan Lei Mei Guanqun Luo
College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China College of Chemistry and Molecular Engineering,Peking University, Beijing 100871, China Department of Forest Products, University of Idaho, Moscow, ID 83844-1132, USA
国际会议
桂林
英文
1-8
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）