A multicyclic polymer with a hyperbranched structure was successfully synthesized. A tailored initiator containing a protected alkynyl group was prepared and used to initiate the atom transfer radical polymerization (ATRP) of styrene. By the combination of a click reaction, a UV-induced coupling reaction and post-modification, an AB₂ type cyclic polystyrene with a protected alkynyl group and two azide groups was obtained, and after deprotection, the clickable cyclic polymer was used as a macromonomer to prepare a multicyclic polymer with a hyperbranched structure by click polymerization via the AB₂ strategy. Gel permeation chromatography (GPC) results showed that the obtained hyperbranched multicyclic polymer contained 47 cyclic units on average.

中文翻译：

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通过AB2环状大分子单体的点击聚合合成具有超支化结构的多环聚合物

具有超支化结构的多环聚合物已成功合成。制备了包含保护的炔基的量身定制的引发剂，并将其用于引发苯乙烯的原子转移自由基聚合（ATRP）。通过点击反应，UV诱导的偶联反应和后改性的组合，获得具有被保护的炔基和两个叠氮基的AB ₂型环状聚苯乙烯，并且在脱保护之后，将可点击的环状聚合物用作大分子单体。通过AB ₂策略的点击聚合制备具有超支化结构的多环聚合物。凝胶渗透色谱法（GPC）结果表明，所得超支化多环聚合物平均含有47个环单元。