Chain-End Functionalization with a Saccharide for 10 nm Microphase Separation: “Classical” PS-b-PMMA versus PS-b-PMMA-Saccharide
Chain-End Functionalization with a Saccharide for 10 nm Microphase Separation: “Classical” PS-b-PMMA versus PS-b-PMMA-Saccharide
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DOI：
10.1021/acs.macromol.8b02069
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发表时间：
2018-10
期刊：
影响因子：
5.5
通讯作者：
Kohei Yoshida;S. Tanaka;Takuya Yamamoto;K. Tajima;R. Borsali;Takuya Isono;T. Satoh
中科院分区：
文献类型：
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作者：
Kohei Yoshida;S. Tanaka;Takuya Yamamoto;K. Tajima;R. Borsali;Takuya Isono;T. Satoh
嵌段共聚物（BCP）的微相分离结构作为自下而上纳米纤维的模板材料引起了人们的广泛关注。与此同时，链端修饰已成为一种领先的简便和有效的技术，用于微调由BCP产生的微相分离结构的形态。在此，我们描述了定义明确的聚苯乙烯-嵌段-聚（甲基丙烯酸甲酯）（PS-b-PMMAs）的制备，其PMMA链端具有高度亲水性的单/寡糖部分（SM-单/寡糖）以及单/寡糖对微相分离行为的影响。PS-b-PMMA使用6-叠氮基-1-己醇的钛醇盐进行末端选择性酯交换，以将叠氮基引入末端MMA单元的侧链中。叠氮基官能化的PS-b-PMMA随后与乙炔基官能化的单糖/寡糖点击反应以产生SM-单糖/寡糖。小角X射线散射和显微镜实验揭示...
Microphase-separated structures of block copolymers (BCPs) have attracted much attention as template materials for bottom-up nanofabrication. At the same time, chain-end modification has become a leading facile and efficient technique for fine-tuning the morphologies of microphase-separated structures generated from BCPs. Herein, we describe the preparation of well-defined polystyrene-block-poly(methyl methacrylate)s (PS-b-PMMAs) bearing highly hydrophilic mono/oligosaccharide moieties at their PMMA chain ends (SM-mono/oligosaccharides) as well as the impact of the mono/oligosaccharide on microphase separation behavior. PS-b-PMMAs were terminal-selectively transesterified using the titanium alkoxide of 6-azido-1-hexanol to introduce azido groups into the side chains of the terminal MMA units. The azido-functionalized PS-b-PMMAs were subsequently click reacted with ethynyl-functionalized mono/oligosaccharides to yield SM-mono/oligosaccharides. Small-angle X-ray scattering and microscopy experiments reveal ...