论文部分内容阅读
用敲击模式原子力显微镜研究了聚苯乙烯-聚甲基丙烯酸甲酯(PS-b-PMMA)两嵌段共聚物薄膜形貌在丙酮蒸汽退火下随时间的演化过程.对于对称的嵌段共聚物薄膜(fPS≈fPMMA,fPS为PS-b-PMMA中PS的体积分数,fPMMA为PMMA的体积分数),通过控制膜厚和平衡态时相周期的比值可以使不同分子量的嵌段共聚物薄膜都实现由蠕虫状结构到孔洞再到条纹的形貌演化过程;对于非对称的嵌段共聚物薄膜,发现当聚苯乙烯组分含量较少(25%,36%)时,薄膜的形貌由无序态分别转变为规则排列的小球和直接转变为条纹结构;而当聚苯乙烯组分含量较多(70%)时,薄膜的形貌则由无序态转变为较平整的表面结构.我们对不同形貌的形成机理进行了详细的讨论.
The morphological evolution of polystyrene-polymethylmethacrylate (PS-b-PMMA) diblock copolymer with acetone vapor annealing over time was investigated by a tapping mode atomic force microscope. For the symmetric block copolymerization FPS ≈ fPMMA, fPS is the volume fraction of PS in PS-b-PMMA, and fPMMA is the volume fraction of PMMA). By controlling the ratio of film thickness and equilibrium phase period, different molecular weight block copolymer films The morphological evolution from worm-like structure to holes to streaks was realized. For the asymmetric block copolymer films, the morphologies of the films were observed when the polystyrene content was low (25%, 36%) From disordered states to regularly arranged spheres, respectively, and directly into striped structures. When the content of polystyrene was more than 70%, the morphology of the films changed from disordered to flat surface Structure. We discussed the formation mechanism of different topography in detail.