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超分子聚合物的光诱导折叠
Takuya Fukushima1, Kenta Tamaki1, Atsushi Isobe1
1Division of Advanced Science and Engineering, Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Journal of the American Chemical Society
|March 23, 2021
概括
研究人员使用二乙烯 (DAE) 光异构化实现了超分子聚合物 (SP) 的光诱导螺旋折叠. 这一过程将随机卷曲的SP转化为稳定的螺旋形结构,为先进的聚合物组织提供了一条新途径.
科学领域:
- 聚合物化学
- 超分子化学
- 材料科学
背景情况:
- 螺旋折叠对于生物和合成聚合物都至关重要.
- 在超分子聚合物 (SP) 中实现受控折叠是具有挑战性的,因为它们对环境敏感.
- 乙烯 (DAE) 光异构化为动态聚合物转化提供了一个潜在的触发器.
研究的目的:
- 为了研究光诱导的可逆折叠/展开在基于粉红的SP.
- 探索DAE光异构的使用,以驱动SP的螺旋折叠.
- 将光诱导螺旋结构的热力学稳定性与直接形成的线性SP进行比较.
主要方法:
- 在非极性溶剂中对巴比酸盐功能化DAE (开放异构体) 的超分子聚合.
- 紫外线照射以诱导DAE环闭和随后的螺旋折叠.
- 使用原子力显微镜 (AFM) 和小角度X射线散射 (SAXS) 的表征.
主要成果:
- 从开放异构体DAE单体中形成的随机绕的SPs表现出缺陷.
- 紫外线辐射诱导了有效的DAE环闭,导致螺旋折叠成螺旋形结构.
- 螺旋式折叠是由螺旋形SP中缺陷修复和环间相互作用驱动的.
- 闭环DAE单体的直接聚合产生了不太稳定的线性带状SP.
结论:
- 动力结构的光诱导后聚合反应可以产生热力学稳定的超分子聚合物.
- 这种方法为创建复杂,有序的聚合物架构提供了一种新的方法.
- 这些发现为设计和控制高分子聚合物结构提供了新的概念.
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