Li Haixia, Wei Wei, Xiong Huiming
Department of Polymer Science, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
Soft Matter. 2016 Feb 7;12(5):1411-8. doi: 10.1039/c5sm02639c. Epub 2015 Dec 10.
A metallo-supramolecular triblock copolymer polystyrene-b-polyisoprene-[Ni(2+)]-polystyrene (SI-[Ni(2+)]-S') has been efficiently prepared using a one-pot, two-step procedure, where the blocks are held by bis-terpyridine complexes at the junction of SI-S'. This specific metallo-supramolecular chemistry is demonstrated to be a robust approach to potentially broaden the diversity of block copolymers. The location of the metal-ligand complexes has a profound influence on the phase separation of the triblock copolymer in the bulk, which results in a distinctive phase segregation between the end blocks and leads to an unexpected asymmetry of the triblock copolymer. The metal-ligand complexes are found to be preferentially located on the adjacent spherical domain and form a core-shell structure. The resulting multiphase material exhibits distinct elastomeric properties with significant toughness and creep recovery behavior. This type of triblock copolymer is anticipated to be a novel class of hybrid thermo-plastic elastomeric material with wide tunability and functionality.
一种金属超分子三嵌段共聚物聚苯乙烯-嵌段-聚异戊二烯-[镍（Ⅱ）]-聚苯乙烯（SI-[Ni(2+)]-S'）已通过一锅两步法高效制备，其中各嵌段通过双吡啶配合物连接在SI-S'的交界处。这种特定的金属超分子化学被证明是一种拓展嵌段共聚物多样性的有效方法。金属-配体配合物的位置对本体中三嵌段共聚物的相分离有深远影响，这导致端嵌段之间出现独特的相分离，并使三嵌段共聚物产生意想不到的不对称性。发现金属-配体配合物优先位于相邻的球形区域并形成核壳结构。所得的多相材料表现出具有显著韧性和蠕变恢复行为的独特弹性体性能。这种类型的三嵌段共聚物有望成为一类具有广泛可调性和功能性的新型混合热塑性弹性体材料。
