Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
J Am Chem Soc. 2013 Oct 30;135(43):15994-7. doi: 10.1021/ja407381f. Epub 2013 Aug 20.
Cyclic brush polymers represent an exciting new macromolecular topology. For the first time, this new topology has been combined with metallo-supramolecular interactions to construct novel cyclic brush polymers. Here, ring-expansion metathesis polymerization was used to synthesize a universal cyclic template with a polynorbornene backbone, which was further modified with the metal-chelating synthon terpyridine. The terpyridine side chains served as the key supramolecular unit for the creation of cyclic polymer brushes and gels. This metallo-supramolecular functionality allowed direct visualization of the cyclic brush polymers by transmission electron microscopy for the first time. This demonstration should open a new area in which supramolecular interactions are used to build an array of novel cyclic brush copolymers as well as other cyclic-polymer-based architectures generating new materials.
环状刷聚合物代表了一种令人兴奋的新型高分子拓扑结构。这一新型拓扑结构首次与金属超分子相互作用相结合，构建了新型环状刷聚合物。在这里，我们使用开环易位聚合反应合成了一种具有聚降冰片烯主链的通用环状模板，然后用金属螯合合成子三联吡啶进一步修饰。三联吡啶侧链作为形成环状聚合物刷和凝胶的关键超分子单元。这种金属超分子功能使环状刷聚合物能够首次通过透射电子显微镜直接可视化。这一演示应该开辟一个新的领域，在这个领域中，超分子相互作用被用来构建一系列新型环状刷共聚物以及其他基于环状聚合物的结构，从而产生新材料。
