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首页> 外文期刊>RSC Advances >Self-assembling nano mixed-brushes having co-continuous surface morphology by melt growing single crystals and comparison with solution patterned leopard-skin surface morphology
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Self-assembling nano mixed-brushes having co-continuous surface morphology by melt growing single crystals and comparison with solution patterned leopard-skin surface morphology

机译：通过熔融生长单晶具有共连续表面形态的自组装纳米混合刷，并与溶液图案的豹皮表面形态进行比较

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Self-assembled mixed-brushes with co-continuous surface morphologies were developed from melts of poly(ethylene glycol)-b-polystyrene (PEG-b-PS) and poly(ethylene glycol)-b-poly(methyl methacrylate) (PEG-b-PMMA) diblock copolymers by a self-seeding technique. Some features of solution-grown matrix-dispersed mixed-brushes having controllable characteristics were briefly recalled and compared with the behavior of the corresponding melt-grown mixed-brushes. The observations implied that some major differences exist between the two growth systems. An obvious deduction made from atomic force microscopy (AFM) height images was that the patterned leopard-skin like surface morphology of the solution-induced mixed-brush single crystals changed to a co-continuous morphology in the melt state. Beside the alteration of the growth environment from solution to melt, this phenomenon was assigned to the dominant kinetic effect which replaced the thermodynamic effect that prevailed in the dilute solution systems. The ratio of PMMA-to PS-covered surface area on the substrate increased from 20/80 for the solution-grown mixed-brush single crystals to 50/50 for the melt-grown ones. Owing to an accelerated kinetic effect, the thickness of a melt-grown mixed-brush single crystal was significantly greater than that observed for a solution-grown mixed-brush single crystal of the same molecular weight. Similar trends, nevertheless, were observed for the thickness changes with molecular weight and crystallization temperature. The lateral sizes of the melt-grown single crystals were about 4-fold larger than those of the solution-grown single crystals (e. g., 24 vs. 6 mu m). The thicknesses were also proven by the interface distribution function of small angle X-ray scattering analysis.
机译：由聚（乙二醇）-b-聚苯乙烯（PEG-b-PS）和聚（乙二醇）-b-聚甲基丙烯酸甲酯（PEG-PE）的熔体开发了具有连续表面形态的自组装混合刷。 b-PMMA）双嵌段共聚物通过自种技术。简要回顾了具有可控特性的溶液生长基质分散混合刷的一些特征，并将其与相应的熔体生长混合刷的行为进行了比较。观察结果表明，两个增长系统之间存在一些主要差异。由原子力显微镜（AFM）高度图像得出的一个明显推论是，溶液诱导的混合刷状单晶的图案化的豹皮状表面形态在熔融状态下变为共连续形态。除了生长环境从溶液转变为熔体之外，这种现象还被归因于主要的动力学效应，该动力学效应取代了稀溶液系统中普遍存在的热力学效应。基板上PMMA与PS覆盖的表面积之比从溶液生长的混合刷单晶的20/80增加到熔融生长的单刷晶体的50/50。由于动力学效应的加速，熔体生长的混合刷单晶的厚度明显大于相同分子量的溶液生长的混合刷单晶的厚度。然而，对于厚度随分子量和结晶温度的变化，观察到相似的趋势。熔体生长的单晶的横向尺寸约比溶液生长的单晶的横向尺寸大4倍（例如，24μm对6μm）。还通过小角度X射线散射分析的界面分布函数证明了厚度。

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