等离子体处理木塑复合材的胶结耐水失效机制

Study on Failure Mechanism of Bonding Joint for Plasma Treated Wood/PE Composites under Water Soaking

利用等离子体处理技术,对木粉/聚乙烯复合材料进行表面处理以改善其胶结性能.研究了等离子体处理后该木塑复合材料胶结接头的耐水性能,并利用接触角测试,SEM,FT-IR等分析手段对其表面性质进行了研究,探讨了胶结接头在水环境中的耐久失效机制.结果表明:随着水浸时间的延长,等离子体处理木粉/聚乙烯复合材料表面接触角先升高而后降低,吸水量增加,且越来越粗糙,而表面的—OH,C—O,CO基团含量先降低而后增加;等离子体处理木粉/聚乙烯材料表面粗糙度、化学基团的变化以及材料的吸水均会对胶结接头水环境中的耐久性产生影响.

The surface of wood/polyethylene（PE） composites was treated by low-pressure glow discharge of air plasma to improve its adhesion properties. To explore the failure mechanism in the condition of water for the bonding joint of wood/PE composites, the water-resistance of plasma treated wood/PE composites bonding joint was studied and the effect of water on the surface properties of plasma treated wood/PE composites was investigated by using the analysis of contact angle, SEM and FT-IR. The results show that the contact angle increases firstly and then decreases with the soaking time extended, the water absorption for the composite increases and the surface for the sample become more and more rough. However, the number of --OH, C--O and C -O groups on the surface of plasma treated wood/PE composites decreases at first and then increases with the soaking time extended. And the failure mechanism in the condition of water for the bonding joint is related to the change on the surface roughness and chemical radicals for the surface of plasma treated wood/PE composites and the water absorption of the composites due to the soaking with water.