Kütahya Ceren, Schmitz Christian, Strehmel Veronika, Yagci Yusuf, Strehmel Bernd
Department of Chemistry and Institute for Coatings and Surface Chemistry, Niederrhein University of Applied Sciences, Adlerstrasse 1, 47798, Krefeld, Germany.
Department of Chemistry and Institute for Coatings and Surface Chemistry, Niederrhein University of Applied Sciences, Adlerstrasse 32, 47798, Krefeld, Germany.
Angew Chem Int Ed Engl. 2018 Jun 25;57(26):7898-7902. doi: 10.1002/anie.201802964. Epub 2018 May 16.
NIR-sensitized photoinduced atom-transfer radical polymerization (ATRP) is possible by using ppm of Cu /tris(2-pyridylmethyl)amine (TPMA) as the catalyst, a polymethine as the photosensitizer, and α-bromophenylacetate as the alkyl halide initiator. Among the polymethines investigated with cationic, zwitterionic, or anionic structures, only the zwitterionic 2 exhibited sensitization activity under NIR light at room temperature resulting in the formation of polymers with controlled molecular weight characteristics and functionalities. The barbital group placed at the meso-position of 2 caused the activity in this photo-ATRP framework. The chain-end fidelity of the polymers was confirmed by chain extension and block copolymerization experiments. The polymerization system exhibits high photostability under NIR light exposure and irradiation dependency as demonstrated by light on/off experiments.
通过使用百万分之几的铜/三（2 - 吡啶甲基）胺（TPMA）作为催化剂、聚甲炔作为光敏剂以及α - 溴苯乙酸酯作为卤代烷引发剂，近红外（NIR）敏化的光诱导原子转移自由基聚合（ATRP）成为可能。在所研究的具有阳离子、两性离子或阴离子结构的聚甲炔中，只有两性离子型的2在室温下的近红外光下表现出敏化活性，从而形成具有可控分子量特征和官能团的聚合物。位于2的中位的巴比妥基团导致了该光引发原子转移自由基聚合体系的活性。通过链延伸和嵌段共聚实验证实了聚合物的链端保真度。如开/关光实验所示，该聚合体系在近红外光照射下表现出高光稳定性和光照依赖性。
