Composition effect on dewetting of ultrathin films of miscible polymer blend
Composition effect on dewetting of ultrathin films of miscible polymer blend
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DOI：
10.1016/j.polymer.2009.08.002
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发表时间：
2009-09
期刊：
影响因子：
4.6
通讯作者：
Jichun You;Shanshan Hu;Yonggui Liao;Kaixu Song;Yongfeng Men;T. Shi;L. An
中科院分区：
文献类型：
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作者：
Jichun You;Shanshan Hu;Yonggui Liao;Kaixu Song;Yongfeng Men;T. Shi;L. An
用原位原子力显微镜(AFM)研究了在145℃时，硅氧化物衬底上的聚甲基丙烯酸甲酯(PMMA)和聚苯乙烯-丙烯腈(SAN)共混膜中由于组成不同而引起的两种脱湿现象及其转变。结果表明，脱湿的形态和途径与组成密切相关。可能的原因是聚合物共混物中组分的变化导致组成波动强度的变化。在讨论组分梯度引起的这种起伏的基础上，分别用描述表面起伏的初始幅度和膜的原始厚度的参数Uq0/E来区分自发脱湿的形貌，包括双连续结构和孔洞。在研究除湿之前，利用掠入射超小角X射线散射(GIUSAX)证实了该共混物在145°C时是相容的。
Two kinds of dewetting and their transition induced by composition fluctuation due to different composition in blend [poly(methyl methacrylate) (PMMA) and poly(styrene-ran-acrylonitrile) (SAN)] films on SiOxsubstrate at 145°C have been studied by in-situ atomic force microscopy (AFM). The results showed that morphology and pathway of dewetting depended crucially on the composition. Possible reason is the variation in intensity of composition fluctuation resulted from the change of components in polymer blend. Based on the discussion of this fluctuation due to the composition gradient, parameter of Uq0/E, which describes the initial amplitude of the surface undulation and original thickness of film respectively, has been employed to distinguish the morphologies of spontaneous dewetting including bicontinuous structures and holes. Prior to the investigation of dewetting, it is confirmed that this blend is miscible at 145°C using grazing incidence ultra small-angle X-ray scattering (GIUSAX).