Multiblock copolymers exhibiting spatio-temporal structure with autonomous viscosity oscillation.
Multiblock copolymers exhibiting spatio-temporal structure with autonomous viscosity oscillation.
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DOI：
10.1038/srep15792
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发表时间：
2015-10-29
影响因子：
4.6
通讯作者：
Yoshida R
中科院分区：
文献类型：
--
作者：
Onoda M;Ueki T;Shibayama M;Yoshida R
在这里，我们报告的阿坝三嵌段共聚物，可以表达微观自主形成和破碎的聚集体在恒定条件下产生宏观粘弹性自振荡的解决方案。阿坝三嵌段共聚物通过RAFT共聚设计成两侧分别具有亲水性B链段和自振荡性A链段。在A段，化学振荡反应的金属催化剂，即，引入Belousov-Zhabotinsky（BZ）反应作为化学机械转换器，以根据氧化还原状态改变聚合物的聚集状态。阿坝三嵌段共聚物的时间分辨DLS测量证实了在还原状态下胶束聚集体的过渡网络结构和在氧化状态下的单聚体结构的存在。这种设计良好的三嵌段共聚物的自主振荡使得具有时空结构的动态仿生软材料成为可能。
Here we report an ABA triblock copolymer that can express microscopic autonomous formation and break-up of aggregates under constant condition to generate macroscopic viscoelastic self-oscillation of the solution. The ABA triblock copolymer is designed to have hydrophilic B segment and self-oscillating A segment at the both sides by RAFT copolymerization. In the A segment, a metal catalyst of chemical oscillatory reaction, i.e., the Belousov-Zhabotinsky (BZ) reaction, is introduced as a chemomechanical transducer to change the aggregation state of the polymer depending on the redox states. Time-resolved DLS measurements of the ABA triblock copolymer confirm the presence of a transitional network structure of micelle aggregations in the reduced state and a unimer structure in the oxidized state. This autonomous oscillation of a well-designed triblock copolymer enables dynamic biomimetic softmaterials with spatio-temporal structure.