PVC发泡板受力前后微观表面形貌变化规律的AFM实验研究

Experimental Study of Microscopic Surface Topography Change of PVC Foam Board Subjected to Pressure Load Based on AFM

本文从微观角度对软质材料之一的PVC发泡板表面形貌与承受压载之间的关系进行实验研究。应用Veeco原子力显微镜(AFM),选取全新的1cm×1cm大小的PVC实验样品,轻轻地放置于AFM样品台上。先测试和记录一定范围内的没有压载作用时试件的微观表面形貌,然后依次测试和记录承受过一定数目压载情形下的表面形貌。其中,压载通过标准计量的砝码实现,重复多次实验,将实验数据进行统计分析。结果显示,经压载作用后,PVC的微观表面特性变化明显。随着压载荷的增加,样品微观表面的高度变化量、平均高度、粗糙度等明显增加,截面起伏度也越加明显。本实验结果对于PVC材料宏观承载应用及其微观结构变化机理等方面的研究将具有一定的参考意义。

Relation between the microscopic surface topography and the pressure load acted on a PVC foam board（as one of the soft material） was experimentally investigated based on Veeco atomic force microscope（AFM）.New square sample with size of 1cm×1cm was prepared and then was carefully placed on sample testing stage.Original microscopic surface topography of the sample was measured first;the microscopic surface topography of the sample subjected different pressure load was also measured respectively.The pressure load was achieved by standard measurement of weight.Above experiment was repeated many times.Results show that the variation of surface height,surface average height and roughness increase obviously,the section waviness is also becoming increasingly obvious along with the increase of pressure load.Above experimental results may afford reference to the investigation of macro bearer application and mechanism of microstructure change for PVC foam board.