聚α-甲基苯乙烯薄膜多孔结构影响因素研究

Formation Factor of Regular Porous Pattern in Polyα-methylstyrene Film

摘要: 采用铸膜液对聚α-甲基苯乙烯（PAMS）薄膜在高湿度条件下形成多孔结构的影响因素进行了研究。结果表明，PAMS的相对分子质量、PAMS浓度、环境温度/湿度、溶剂挥发性及液膜厚度等因素决定了薄膜表面孔洞的大小及其分布。液膜中水滴的运动是水滴间毛细管作用力和Bénard-Marangoni对流共同作用的结果，这是孔洞形成规则排列的主要驱动力。

Abstract: Regular poly α-methylstyrene (PAMS) porous film with macron-sized cells was prepared by casting the solution in the condition with high humidity. In this paper, the effects of the molecular weight of PAMS, PAMS concentration, humidity, temperature, volatile solvents and the thickness of liquid of solution on formation of regular porous pattern in PAMS film were discussed. The results show that these factors significantly affect the pore size and the pore distribution. The capillary force and Bénard-Marangoni convection are main driving forces for the water droplet moving and making pores regular arrangement.