Mechanical confinement effects on the phase separation morphology of polymer blend thin films
Mechanical confinement effects on the phase separation morphology of polymer blend thin films
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DOI：
10.1103/physreve.57.5811
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发表时间：
1998-05
影响因子：
2.4
通讯作者：
K. Dalnoki-Veress;J. Forrest;J. Dutcher
中科院分区：
文献类型：
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作者：
K. Dalnoki-Veress;J. Forrest;J. Dutcher
我们测量了聚苯乙烯-聚甲基丙烯酸甲酯的相分离形貌！~ PSPMMA !在氧化硅（SiOx）衬底上混合厚度为h的薄膜，并加盖SiOx覆盖层。我们观察到小封盖层厚度L时出现了一种新的相分离形态，并且随着L的增加，从横向形态转变为层状形态。我们提出了一个简单的模型，解释了观察到的侧向形态和形态转变，根据自由能增加与形成富ps和富pmma域之间的界面相关的平衡，以及与SiOx盖层弹性弯曲相关的自由能增加。该简单模型揭示了过渡盖层厚度Lc与聚合物共混膜厚度h的关系，并对Lc进行了合理的定量预测。@s1063 - 651 x ~ 98 !11505 - 2 #
We have measured the phase separation morphology of polystyrene–poly ~methyl methacrylate! ~PSPMMA! blend films of thickness h on a silicon oxide ~SiO x) substrate with a SiOx capping layer. We observe a novel phase separation morphology for small capping layer thicknesses L and a transition from lateral to lamellar morphology as L is increased. We present a simple model that explains the observed lateral morphology and the transition in morphology in terms of a balance between the free energy increase associated with forming the interfaces between PS-rich and PMMA-rich domains and the free energy increase associated with the elastic bending of the SiOx capping layer. The simple model reveals the dependence of the transition capping layer thickness Lc on the polymer blend film thickness h , and gives a reasonable quantitative prediction of Lc . @S1063-651X~98!11505-2#