中文摘要：

利用原子力显微镜研究了带有自然氧化层硅基底上聚苯乙烯薄膜在不同非溶剂诱导下的去润湿过程.研究发现,非溶剂是通过渗透取代机理诱导高分子薄膜发生去润湿.薄膜的形貌取决于成孔过程与孔增长过程的相对速度.当聚苯乙烯（PS）薄膜厚度为15 nm时,随着溶剂烷基链的增长,成孔数显著降低;然而孔开始合并时孔径明显地增加.当PS薄膜厚度增加到25 nm时,随着溶剂烷基链的增长,成孔数略有降低,薄膜形貌形成长程有序的双连续的结构.当PS膜厚为35 nm时,与其它2个膜厚相比,成孔数大幅下降.此外,温度和分子量能进一步降低去润湿过程中的成孔数,从而形成分形结构形貌.

英文摘要：

We investigated the dewetting process of thin polystyrene（ PS） film induced by different non-solvents via atomic force microscope（ AFM）. It is found that the non-solvent induced dewetting of thin PS film is via the penetration-replacement mechanism. The morphology of thin PS film depends on the relative velocity of the hole forming process and the hole growth process. When the thickness of PS film is 15 nm,with the increase of the alkyl chain of solvents,the number of holes significantly decreased,while the size of the holes obviously increased. When the thickness of PS film increased to 25 nm,with the increase of the alkyl chain of solvents,the formation of the number of holes is slightly low and the film morphology is a long-range ordered double continuous structure. When the PS film thickness is 35 nm,the number of holes decreased significantly comparing with the other two films. In addition,temperature and molecular weight can further reduce the number of holes in the process of dewetting and form fractal morphology.