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Carbon Dots as a Promising Green Photocatalyst for Free Radical and ATRP-Based Radical Photopolymerization with Blue LEDs.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-01-21 , DOI: 10.1002/anie.201912343
Ceren Kütahya 1 , Ping Wang 2 , Shujun Li 2 , Shouxin Liu 2 , Jian Li 2 , Zhijun Chen 2 , Bernd Strehmel 1
Affiliation  

Carbon dots (CDs) have been used for the first time as a sensitizer to initiate and activate free radical and controlled radical polymerization, respectively, based on an ATRP protocol with blue LEDs. Consideration of diverse heteroatom‐doped CDs indicated that N‐doped CDs could serve as an effective photocatalyst and photosensitizer in combination with LEDs emitting either at 405 nm or 470 nm. Free radical polymerization was initiated by combining the CDs with an iodonium or sulfonium salt in tri(propylene glycol) diacrylate. Polymerization of methyl methacrylate (MMA) by photo‐induced ATRP was achieved with CDs and ethyl α‐bromophenylacetate using CuII as catalyst in the ppm range. The polymers obtained showed temporal control, narrower dispersity ≲1.5, and chain‐end fidelity. The first‐order kinetics and ON/OFF experiments additionally gave evidence of the constant concentration of polymer radicals. No remarkable cytotoxic activity was observed for the CDs, underlining their biocompatibility.

中文翻译:

碳点作为一种有前景的绿色光催化剂,可用于蓝色 LED 的自由基和基于 ATRP 的自由基光聚合。

基于蓝色 LED 的 ATRP 协议,碳点 (CD) 首次被用作敏化剂,分别引发和激活自由基和受控自由基聚合。对不同杂原子掺杂 CD 的考虑表明,N 掺杂 CD 可以与发射 405 nm 或 470 nm 波长的 LED 结合使用,作为有效的光催化剂和光敏剂。通过将CD与碘鎓盐或锍盐在三(丙二醇)二丙烯酸酯中混合来引发自由基聚合。使用 CD 和 α-溴苯乙酸乙酯,使用 Cu II作为催化剂,在 ppm 范围内通过光诱导 ATRP 实现了甲基丙烯酸甲酯 (MMA) 的聚合。获得的聚合物表现出时间控制、更窄的分散度≲1.5和链端保真度。一级动力学和开/关实验还提供了聚合物自由基浓度恒定的证据。CD 没有观察到显着的细胞毒活性,强调了它们的生物相容性。
更新日期:2020-01-22
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