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首页> 外文期刊>Bulletin of the Chemical Society of Japan >AFM Observation of Stimuli-Responsive Stretching Behavior for Spirobenzopyran/Crown-Ether Copolymer
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AFM Observation of Stimuli-Responsive Stretching Behavior for Spirobenzopyran/Crown-Ether Copolymer

机译：螺旋吡喃/冠状醚共聚物刺激响应拉伸行为的AFM观察

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摘要

We have observed stretching behavior of a stimuli-responsive polymer chain bearing two functional groups, spirobenzopyran (SP) and crown ether (CR), at the side chain (SP/CR copolymer) by atomic force microscopy (AFM). The spirobenzopyran side chain can undergo photoisomerization from its electrically neutral spiropyran form to zwitterionic merocyanine by UV irradiation. The crown ether side chain can complex with metal ions. These reactions in the side chains would cause changes in their geometric structure and/or physical properties, resulting in the enhanced bifunctionality of SP/CR copolymer based on their stimuli-responsive ability. In this study, SP/CR copolymer, which was adsorbed on mica substrate, was stretched by AFM tip, when external stimuli (i.e., photoirradiation or metal ion addition) were applied. The force-extension curves of SP/CR copolymer were then analyzed by curve fitting based on a theoretical model of polymer chain elasticity to elucidate the external-stimuli effect on the polymer stretching behavior at the single molecule level.
机译：我们观察到通过原子力显微镜（AFM）在侧链（SP / Cr共聚物）处携带两种官能团，螺苯并吡喃（SP）和冠醚（Cr）的刺激聚合物链的拉伸行为。通过UV辐射从其电中性螺吡喃形式从其电中性螺旋吡喃形式进行光学异构化。冠状醚侧链可与金属离子复合。侧链中的这些反应会导致其几何结构和/或物理性质的变化，从而基于其刺激响应能力来增强SP / Cr共聚物的双官能团。在该研究中，当施加外部刺激（即光辐射或金属离子加成）时，通过AFM尖端吸附在云母底物上的SP / Cr共聚物。然后基于基于聚合物链弹性的理论模型来分析SP / Cr共聚物的力 - 延伸曲线，以阐明单分子水平的聚合物拉伸行为的外刺激作用。

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