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报道了一类新型的α-ωn型“线性-超支化”超分子嵌段共聚物.分别通过可控阴离子开环多支化聚合方法(ROMBP)和可逆加成-断裂链转移聚合方法(RAFT)合成了含有一个β-环糊精基团的亲水超支化缩水甘油醚(CD-g-HPG)和含有一个偶氮苯基团的疏水线性聚甲基丙烯酸甲酯(PMMA-AZO).两者可以通过β-环糊精和偶氮苯基团之间的主客体识别作用形成两亲性线性-超支化超分子嵌段共聚物PMMA-b-HPG.由于线性PMMA-AZO残留有RAFT聚合时链转移剂中的三硫代酯结构,超分子聚合物PMMA-b-HPG可以通过三硫代酯与金形成的硫-金键(S-Au)对金表面进行修饰形成自组装单分子层(SAM).修饰后的金表面呈现出光控的可逆亲疏水性能.在紫外光下,由于β-环糊精/偶氮苯之间的主客体识别作用被破坏,亲水的CD-g-HPG从表面脱离,表面变为疏水;在可见光下,如果重新将金片浸泡在CD-g-HPG溶液中,金表面的亲水性可以恢复.
A new type of α-ωn-type “linear-hyperbranched” supramolecular block copolymers was reported, which were synthesized by controlled cyclic open-chain multi-branch polymerization (ROMBP) and reversible addition-fragmentation chain transfer polymerization (CD-g-HPG) with a β-cyclodextrin group and hydrophobic linear polymethylmethacrylate (PMMA-AZO) with one azobenzene group ), Both of which can form amphiphilic linear-hyperbranched supramolecular block copolymer PMMA-b-HPG through the host-guest recognition between β-cyclodextrin and azobenzene groups.Because of the linear PMMA-AZO residues With the thioester structure in the chain transfer agent during the RAFT polymerization, the supramolecular polymer PMMA-b-HPG can be modified from the gold surface by the S-Au bond formed by trithioester with gold Assembled monolayer (SAM) .The modified gold surface showed a reversible hydrophobic property of light control.Under ultraviolet light, due to the host-guest recognition between β-cyclodextrin / azobenzene was destroyed, the hydrophilic Of CD-g-HPG from the surface, the surface becomes hydrophobic; in the visible light, if you re-gold gold immersed in CD-g-HPG solution, the gold surface hydrophilic Recovery.