Water-soluble starlike polymers containing concentrated carboxyl groups were conveniently synthesized via the combination of “click” chemistry and atom transfer radical polymerization. The starlike polymer was composed of a shorter polyacrylate main chain and longer poly(acrylic acid) side chains. Alkyne and azide groups were introduced to the structure units of the main chain by esterification and the chain end of the side chain by substitution reaction of NaN3 to bromine, respectively. By click chemistry between alkyne and azide group, well-defined starlike polymers were obtained. FT-IR, gel permeation chromatography, and 1H NMR were used to characterize the resulting polymers. Aggregation behavior demonstrated by transmission electron microscopy was observed when the starlike polymers were dispersed in water at pH 7.0–7.5. Using the starlike polymers as templates, water-soluble silver nanoclusters mainly consisting of Ag2 supported by the generated nanoparticles and carboxyl groups were successfully synthesized. Also, their optical properties and morphology were characterized by UV–vis absorption spectra and TEM.

中文翻译：

---

水溶性星状聚（丙烯酸）接枝聚合物：作为银纳米团簇模板的制备和应用

通过“点击”化学和原子转移自由基聚合的结合，可以方便地合成含有浓缩羧基的水溶性星状聚合物。星状聚合物由较短的聚丙烯酸酯主链和较长的聚（丙烯酸）侧链组成。炔基和叠氮基分别通过酯化作用引入主链的结构单元，通过NaN3 对溴的取代反应引入侧链的链端。通过炔烃和叠氮化物基团之间的点击化学，获得了明确定义的星状聚合物。FT-IR、凝胶渗透色谱和 1H NMR 用于表征所得聚合物。当星状聚合物分散在 pH 值为 7.0-7.5 的水中时，通过透射电子显微镜观察到聚集行为。以星状聚合物为模板，成功合成了主要由生成的纳米颗粒和羧基负载的 Ag2 组成的水溶性银纳米团簇。此外，它们的光学性质和形态通过紫外-可见吸收光谱和 TEM 进行表征。