Local Composition of Nanophase-Separated Mixed Polymer Brushes
Local Composition of Nanophase-Separated Mixed Polymer Brushes
复制标题
纳米相分离混合聚合物刷的局部组成
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Rühe
中科院分区：
文献类型：
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作者：
S. Santer;Alexey Kopyshev;Hyun;J. Rühe
通过表面引发聚合合成的聚苯乙烯-聚（甲基丙烯酸甲酯）（PS-PMMA）混合刷显示纳米相分离成定义的图案，这取决于刷的分子参数。研究了两组混合刷：（i）具有固定的接枝密度和PS链的分子量，但不同的PMMA聚合物的分子量，和（ii）具有不同的接枝密度的PMMA链，而PS链和PS和PMMA链的分子量保持恒定。发现PS和PMMA链在单层内的局部分布和构成纳米图案的域的大小、形状和位置随刷子暴露的溶剂的性质而变化。刷处理循环第一，无论是良好的溶剂为两个块，导致强烈的溶胀和结构擦除，然后与选择性溶剂，诱导的纳米相分离。结果发现，在刷子暴露于…
Polystyrene−poly(methyl methacrylate) (PS−PMMA) mixed brushes synthesized by surface-initiated polymerization show nanophase separation into defined pattern depending on the molecular parameters of the brushes. Two sets of mixed brushes are studied: (i) with fixed grafting density and molecular weight of the PS chains, but differing in the molecular weight of PMMA polymer, and (ii) with varying grafting density of the PMMA chains while that of the PS chains and the molecular weight of PS and PMMA chains are kept constant. The local distribution of PS and PMMA chains within the monolayer and the size, shape, and position of the domains constituting the nanopattern are found to vary with the nature of the solvent to which the brushes are exposed. The brushes are treated cyclically first with either a good solvent for both blocks, leading to strong swelling and structure erasure, and then with a selective solvent, which induces the nanophase separation. It was found that in the case of the brush exposed to ...