Formation of cylindrical phase structure in PMMA/HBP polymer blend films
Formation of cylindrical phase structure in PMMA/HBP polymer blend films
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DOI：
10.1016/j.polymer.2005.10.011
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发表时间：
2005-11
期刊：
影响因子：
4.6
通讯作者：
L. Yao;Xie Xuming;Z. Qi;Tang Liming
中科院分区：
文献类型：
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作者：
L. Yao;Xie Xuming;Z. Qi;Tang Liming
利用相差显微镜研究了聚甲基丙烯酸甲酯（PMMA）/超支化聚酯酰胺（HBP）共混物在玻璃基底上的相分离过程。不同组分比的薄膜表现出不同的相分离过程和相形貌。在约几百纳米的膜厚下，在具有较低HBP含量的膜中观察到圆柱形分散相。研究了样品的组成和厚度对这种特殊形貌形成的影响。结果表明，基体与HBP之间的相互作用和共混膜的厚度是形成相形态的重要因素，而特殊的柱状形貌的出现取决于组分比和膜厚。存在一个临界膜厚，超过该临界膜厚，可以观察到特殊的形貌。临界厚度随着HBP重量百分比的变化而变化。我们的研究为获得具有特殊结构的聚合物薄膜提供了一种可能的战略途径，这些薄膜在广泛的领域中具有越来越多的应用。
The evolution of the phase separation was investigated for poly(methyl methacrylate)(PMMA)/hyperbranched poly(ester-amide)(HBP) blend films on glass substrate by means of phase contrast microscopy. The films with different component ratios show different phase separation processes and phase morphologies. At a film thickness of about several hundreds nanometers, a cylindrical dispersed phase was observed in the films with lower HBP content. The effects of the composition and sample thickness on the formation of the special morphology were also studied. It is found that the interaction between the substrate and HBP and the thickness of blend film are essential factors for the formation of the phase morphology and the appearance of the special cylindrical morphology depends on the component ratio and the film thickness. There is a critical film thickness, above which the special morphology could be observed. The critical thickness varies as the HBP weight percent changes. Our research provides a possible strategic way to obtain polymer films with special structure which are important for an increasing number of applications in wide fields.