中文摘要：

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.

英文摘要：

Herein,the synthesis of an α-ωn＂linear-hyperbranched＂supramolecular block copolymer was reported. First,a linear polymer PMMA-AZO composed of poly（ methyl methacrylate） with an azobenzene group at the end was synthesized via reversible addition-fragmentation chain transfer（RAFT） polymerization.Secondly,a hyperbranched polymer CD-g-HPG composed of hyperbranched polyglycerol with a β-cyclodextrin group at the focal point was synthesized by ring-opening multibranching polymerization（ ROMBP）. Then,the linear PMMA-AZO and hyperbranched CD-g-HPG were conjugated together through the specific CD /AZO host-guest interactions,leading to the formation of amphiphilic linear-hyperbranched supramolecular block copolymer PMMA-b-HPG. The supramolecular polymer of PMMA-b-HPG can be grafted onto gold surface to form self-assembled monolayer through S—Au bond generated from the α end of trithiocarbonate group,which is introduced into PMMA-AZO by chain transfer agent used in RAFT polymerization. As a result,the modified surface exhibits a hydrophilic feature. When exposed to UV light,however,the hydrophilic CD-g-HPG polymers are dropped off from the surface because of the dissociation of AZO /CD complex,and then the surface turns into hydrophobic. Further immersing the gold surface into CD-g-HPG solution,a hydrophilic surface can be restored. In this way,a modified gold surface which can be tuned reversibly between hydrophilic and hydrophobic under light stimuli was prepared.