Photoinduced Iron-Catalyzed Atom Transfer Radical Polymerization with ppm Levels of Iron Catalyst under Blue Light Irradiation
Photoinduced Iron-Catalyzed Atom Transfer Radical Polymerization with ppm Levels of Iron Catalyst under Blue Light Irradiation
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DOI：
10.1021/acs.macromol.7b01708
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发表时间：
2017-10-24
期刊：
影响因子：
5.5
通讯作者：
Matyjaszewski, Krzysztof
中科院分区：
文献类型：
--
作者：
Dadashi-Silab, Sajjad;Pan, Xiangcheng;Matyjaszewski, Krzysztof
光诱导原子转移自由基聚合（ATRP）主要是利用铜基催化体系进行的。最近发展的铁催化的光化学ATRP在高能紫外光照射下使用大量的铁催化剂。本文报道了在蓝光照射下用ppm量（100-400 ppm）的溴化铁（III）/溴化四丁基铵作为催化剂介导的成功的光诱导铁催化ATRP。几种甲基丙烯酸酯单体的聚合具有良好的控制，提供了与理论值良好一致的分子量和低分散性（D < 1.20）。近定量的单体转化率（类似于95%），使原位扩链和嵌段共聚，表明高保留链端功能。值得注意的是，该系统可以耐受氧气，使得能够在空气存在下合成具有良好链端官能度的明确定义的聚合物。
Photoinduced atom transfer radical polymerization (ATRP) has been mainly explored using copper-based catalytic systems. Recently developed iron-catalyzed photochemical ATRP employed high amounts of iron catalysts under high-energy UV light irradiation. Herein, a successful photoinduced iron-catalyzed ATRP mediated under blue light irradiation with ppm amounts (100-400 ppm) of iron(III) bromide/tetrabutylammonium bromide as the catalyst is reported. Several methacrylate monomers were polymerized with excellent control providing molecular weight in good agreement With theoretical values and low dispersity (D < 1.20). Near-quantitative monomer conversions (similar to 95%) enabled in situ chain extension and block copolymerization, indicating high retention of chain-end functionality. Notably, this system can tolerate oxygen, enabling synthesis of well-defined polymers with good chain-end functionality in the presence of air.