Abstract An easy and rapid strategy is developed to synthesize light responsive single-chain nanoparticles via photoinduced radical coupling of carbazole moieties in the side chain of polymer. Firstly, nitroxide-mediated radical polymerization is carried out for the synthesis of chloride functional styrenic copolymer. Pendant chloride groups of the polystyrene copolymer are converted to carbazole units by one-step modification. Constructed functional polymer undergoes photochemically intramolecular crosslinking using carbazole step-growth polymerization. Size of the nanoparticles can be manipulated by changing the degree of polymerization which is dependent to the dose of UV exposure. Achieved single-chain nanoparticles exhibit higher glass transition temperatures and lower hydrodynamic radii compared to their linear analogue. Polymeric nanoparticles are successfully employed for the cyclohexane oxide polymerization as cationic photoinitiators in the presence of an iodonium salt.

中文翻译：

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通过悬垂咔唑单元的光诱导逐步生长聚合快速合成荧光单链纳米颗粒

摘要 通过光诱导聚合物侧链咔唑部分的自由基偶联，开发了一种简单快速的策略来合成光响应单链纳米粒子。首先，进行氮氧介导的自由基聚合以合成氯化物官能苯乙烯共聚物。聚苯乙烯共聚物的氯侧基通过一步改性转化为咔唑单元。构建的功能聚合物使用咔唑逐步生长聚合进行光化学分子内交联。纳米粒子的尺寸可以通过改变聚合度来控制，聚合度取决于紫外线照射的剂量。与线性类似物相比，获得的单链纳米粒子表现出更高的玻璃化转变温度和更低的流体力学半径。