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通过grafting-onto方法合成高侧链接枝密度的环形侧链聚合物刷并进行结构表征.先通过开环易位聚合(ROMP)制备带有炔基侧基的线形聚降冰片烯衍生物主链(l-PND),通过原子转移自由基聚合(ATRP)和铜催化的叠氮-炔环加成(Cu AAC)反应制备带有一个叠氮基的环形聚丙烯酸叔丁酯侧链(c-Pt BA),再利用Cu AAC反应将环形侧链高密度地接入主链,得到环形侧链聚合物刷.通过核磁氢谱(1H-NMR)、凝胶渗透色谱(GPC)和红外光谱(IR)对聚合物主/侧链及聚合物刷的结构和组成进行了表征.该聚合物刷主链聚合度为400,高接枝密度的环形侧链使主链构象伸展.聚合物刷在原子力显微镜(AFM)下呈单分子蠕虫形貌(柱状形貌),分子长度为200 nm,直径为30 nm.
The ring side chain polymer brush with high side chain grafting density was synthesized by grafting-onto method and structural characterization was carried out.Firstly, linear polynorbornene derivative backbone with alkynyl side groups was prepared by ring opening metathesis polymerization (ROMP) (l-PND) was prepared by atom transfer radical polymerization (ATRP) and copper-catalyzed azido-alkynyl cycloaddition reaction (Cu AAC) (Pt-BA), and then ring-side chain was inserted into the main chain by Cu AAC reaction to obtain circular side-chain polymer brush.H NMR, GPC and IR spectra ( IR) was used to characterize the structure and composition of the polymer main / side chains and polymer brushes.The polymer brush had a main chain degree of polymerization of 400 and a high degree of grafting of the ring side chain to the main chain conformation.Polymer brushes Atomic force microscope (AFM) showed a monomorphic worm morphology (columnar morphology) with a molecular length of 200 nm and a diameter of 30 nm.