单分子Janus纳米复合颗粒的可控制备及组装

含有炔烃官能团的苯乙烯类单体（B嵌段），与聚苯乙烯（A嵌段）和聚乙二醇（C嵌段）活性聚合制备ABC三嵌段共聚物。低温时含炔烃嵌段可与羰基金属化合物以1：1络合；在加热时，炔烃/羰基金属复合链段与碳碳叁键进一步反应导致分子内交联，并原位生成磁性纳米颗粒。利用此特点加热引发ABC嵌段聚合物分子内交联而得到交联高分子/磁性金属复合Janus颗粒。对交联得到的颗粒部位进行包裹并在表面功能复合，研究其自组装和在界面上排布特性。

Alkyne pendant group-contained styrene monomers will be copolymerized by RAFT with polyethylene glycol (PEO) and polystyrene (PS) block to form ABC triblock copolymers. Metal carbonyl coordination compounds can form stable complex with the alkyne groups at 1:1 ratio at room temperature. When heated, the alkyne/metal carbonyl adducts will crosslink the polymer matrix and produce magnetic nanoclusters in situ. Single-molecular magnetic Janus particles can be formed by heat-triggered intra-molecular crosslinking of the alkyne/cobalt block. The globular site of the Janus particles will be encapsulated in order to enable further surface functionalization. The self-assemble behavior and interface arrangement of these composite magnetic Janus nanoparticles will be studied.