聚合物PDMS片表面特性的AFM和XPS初步研究

本文用原子力显微镜(AFM),研究常用固化模具材料玻璃、有机玻璃(PMMA)和塑料制作的PDMS盖片的表面特性。并用XPS分析PDMS表面的化学组成,表明在优化的PDMS芯片制作条件下,PDMS芯片的自粘粘合力取决于盖片的表面粗糙度。

AFM and XPS study of surface properties of PDMS plate

The Polydimethylsiloxane(PDMS)is widely applied in the casting of microfluidic chips.Under the same conditions,the bonding intensity of chips is greatly affected by the material of curing mould.For understanding the reason of this phenomenon,the surface properties of cover PDMS plate casted by three moulds made of commonly used materials glass,PMMA and plastic are studied by the AFM and XPS measurement.The results of AFM show the surface roughness of cover plate casted by PMMA mould is obviously smaller than other chips,that casted by plastic mould is in the middle,and that casted by glass mould is the largest.On the other hand,the analysis of XPS spectrum indicates that there is no chemisorption and physisorption on the surface of PDMS cover plate during casting by three moulds under the optimal making conditions.Therefore,it is concluded that the surface roughness of PDMS plates is the most effective factors on the bond intensity of PDMS chips.