环境湿度对等离子体处理聚乙烯木塑复合材料表面时效性的影响

Effect of Humidity on the Ageing of Plasma Treated Wood/PE Composites

利用接触角、扫描电镜(SEM)、红外光谱(FT-IR)、X射线光电子能谱(XPS)和胶接强度等分析方法研究了湿度对等离子体处理聚乙烯木塑复合材料表面时效性的影响。结果表明,不同的湿度对表面处理的时效性影响不同。随时间的延长,23%湿度下放置的试样,表面C元素含量逐渐增加,O元素含量逐渐降低,含氧极性基团逐渐减少,材料表面粗糙度变化不大,粘接强度下降;而84%湿度下放置的试样,表面C元素含量先增加而后降低,O元素含量先降低而后增加,含氧极性基团先减少而后增多,材料表面出现微裂纹,粘接强度先降低而后增大。湿度较大的放置环境对等离子体处理材料表面的时效性影响更大。

The effect of humidity of storage environment on the ageing of plasma-treated wood/PE composites surface was studied by the contact angle, SEM, FT-IR, XPS and bonding strength test. The results show that the different humidity has different effects on the ageing of treated wood/PE composites surface. With the storage time expanding,the relative content of C element in the surface of plasma-treated composites stored under the environmental moisture of 23 % increases, the relative content of O element decreases, the oxygen-containing groups decreases, surface roughness changes a little and the bonding strength decreases. With the storage time expanding, the relative content of C element in the surface of plasma-treated composites stored under the environmetal moisture of 84 % increases firstly and then decreases, the relative content of O element and the oxygen-containing groups decrease firstly and then increase, and some micro cracks occurrs on the surface, leading to decrease and subsequent increase of the bonding strength. The environment with higher moisture content have greater effect on the ageing in the surface of plasma-treated composites.