Visible-Light-Controlled Living Radical Polymerization from a Trithiocarbonate Iniferter Mediated by an Organic Photoredox Catalyst
Visible-Light-Controlled Living Radical Polymerization from a Trithiocarbonate Iniferter Mediated by an Organic Photoredox Catalyst
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DOI：
10.1021/acsmacrolett.5b00241
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发表时间：
2015-05-01
影响因子：
7.015
通讯作者：
Johnson, Jeremiah A.
中科院分区：
文献类型：
--
作者：
Chen, Mao;MacLeod, Michelle J.;Johnson, Jeremiah A.
报道了用紧凑型荧光灯（CFL）和10-苯基吩噻嗪作为有机光氧化还原催化剂，从三硫代碳酸盐杂化物中聚合丙烯酸酯和丙烯酰胺的活性自由基反应。有了这个系统，链生长可以有效地在“开”和“关”之间切换，以响应可见光。聚合物的摩尔质量随转化率的增加而线性增加，得到较窄的摩尔质量分布。三硫代碳化物-干扰物的优异保真度使得从大干扰物制备三嵌段共聚物在相同的可见光介导方案下，使用不含光氧化还原催化剂的紫外光或在传统的热诱导RAFT条件下。我们期望这种无金属、可见光介导聚合的简单性和效率将使一系列材料在温和条件下的合成和改性成为可能。
Living radical polymerization of acrylates and acrylamides from trithiocarbonate iniferters using a compact fluorescent lamp (CFL) bulb and 10-phenylphenothiazine as an organic photoredox catalyst is reported. With this system, chain growth can be efficiently switched between "on" and "off" in response to visible light. Polymer molar masses increase linearly with conversion, and narrow molar mass distributions are obtained. The excellent fidelity of the trithiocarbonate-iniferter enables the preparation of triblock copolymers from macro-iniferters under the same visible-light mediated protocol, using UV light without a photoredox catalyst or under traditional thermally induced RAFT conditions. We expect that the simplicity and efficiency of this metal-free, visible-light-mediated polymerization will enable the synthesis and modification of a range of materials under mild conditions.