协同处理对湿热环境下木粉/聚乙烯复合材料表面性质演变的影响

Effect of combination treatment on evolvement of surface properties for wood powder/polyethylene composites under hygrothermal environment

采用硅烷偶联剂涂覆与等离子体放电协同处理的方法处理木粉/聚乙烯(WP/PE)复合材料表面,以改善其胶接性能。利用胶接强度测试、FTIR和X射线光电子能谱研究了硅烷偶联剂涂覆和等离子体放电的协同表面处理对WP/PE湿热环境下表面性质演变的影响,探究协同处理的WP/PE胶接接头湿热环境下的胶接耐久性。结果表明,协同处理后,WP/PE表面有含氧极性基团生成,且在偶联剂与材料表面之间形成了化学键接,胶接性能大为改善。湿热环境下,虽然处理试样的表面没有新的化学基团产生,但表面元素的化学环境发生了改变。WP/PE表面在湿热环境下的性质演变会直接影响其胶接接头的耐久性。协同表面处理能够降低湿热环境下WP/PE表面性质的改变程度,从而提高WP/PE的胶接性能,尤其是湿热环境下的胶接耐久性能。

The surface of wood powder/polyethylene （WP/PE）composites was treated by a combined treatment of sanding then coating with a silane coupling agent and plasma discharge to improve its adhesion properties.To ex-plore the durability of adhesive joint in hot and humid environment,the bonding strength tests and the analysis of FTIR and XPS were used to study the effect of combination treatment on the surface properties changes of WP/PE under boiling environment.The results show that,there are oxygen polar groups generated on the surface of WP/PE after combination treatment,and the chemical bonds between silane coupling agent and composite surface are formed,which improves the bonding performances tremendously.There is no new chemical group generated on the surface of WP/PE with the increase of boiling time,but the chemical environment for the element on the surface changes.The change on surface properties of WP/PE under hot and humid environment will affect the durability of adhesive joint directly.The change degree of surface properties for WP/PE is retarded by combination treatment, and the bonding properties are improved consequently,especially for the water resistance of adhesive joint.