PMMA/超支化聚(酯-酰胺)共混物薄膜中柱状相结构的形成

FORMATION OF CYLINDER LIKE PHASE STRUCTURE IN PMMA/HYPERBRANCHED POLY(ESTER-AMIDE) BLEND THIN FILMS

利用相差显微镜、三维形貌测量仪对聚甲基丙烯酸甲酯 超支化聚 (酯 酰胺 ) (PMMA HBP)共混物薄膜在玻璃基板作用下的相分离行为进行了研究 .结果表明 ,不同组分比的共混物薄膜会呈现不同的相形态和相分离过程 .当薄膜厚度在 5 0 0nm左右 ,HBP为低组分时 ,发现了一种特殊的分散相为圆柱状的相形态 ,并对该相形态出现的条件进行了研究 .认为基板与组分之间的相互作用和薄膜厚度决定了圆柱状结构形成 .

Using phase contrast microscope, the evolution of the phase separation was investigated for poly( methyl methacrylate) (PMMA)/hyperbranched poly (ester-amide) (HBP) blend thin films on glass substrates. The films with different component ratios show different phase morphologies and phase separation processes. At a film thickness of about 500 nm, a cylinder-like dispersed phase was observed in the films with low HBP content. The conditions for the special morphology occurring were also studied. The interaction between the substrate and HBP and the thickness of blend films are essential factors for the formation of the phase morphology. It was also found that the appearance of the special cylinder-like morphology depends on the component ratio and the film thickness. Only the film thickness was between the upper critical film thickness and the lower critical film thickness can the special structure be observed. There was a transition in the critical thickness as the HBP weight percent varied.