Photocontrolled Organocatalyzed Living Radical Polymerization Feasible over a Wide Range of Wavelengths
Photocontrolled Organocatalyzed Living Radical Polymerization Feasible over a Wide Range of Wavelengths
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DOI：
10.1021/jacs.5b02617
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发表时间：
2015-04-29
影响因子：
15
通讯作者：
Kaji, Hironori
中科院分区：
文献类型：
--
作者：
Ohtsuki, Akimichi;Lei, Lin;Kaji, Hironori
在较宽的光照范围内进行了光控有机催化活性自由基聚合。波长(350-750 nm)。通过开发合适的有机催化剂，聚合反应被诱导并控制在所需的波长。该系统对辐射波长有很好的响应；聚合反应可以瞬间开启和关闭，聚合速率可以通过改变辐射波长进行灵敏的调节。对于甲基丙烯酸酯单体，聚合物的相对分子质量及其分布(M-w/M-n=1.1-1.4)得到了很好的控制，在许多情况下可以达到相当高的转化率。单体范围包括各种官能化的甲基丙烯酸酯，并得到了它们的嵌段共聚物。如此宽的波长范围的可行性和对波长的良好响应是前所未有的特征。作为该体系波长响应性的独特应用，我们展示了活性自由基聚合和另一种聚合(开环聚合)的“一锅”选择性调节，其中调节是通过简单地改变照射波长来实现的。操作简便、适用于多种聚合物设计是其优势所在。聚合反应。
Photocontrolled organocatalyzed living radical polymerization was Conducted over a wide range of irradiation. wavelengths (350-750 nm). The polymerization was induced and controlled at the desired Wavelengths by exploiting suitable organic catalysts. This system was finely responsive to the irradiation wavelength; the polymerization was instantly switched on and off, and the polymerization rate-was sensitively modulated by altering the irradiation wavelength. The polymer molecular weight and its distribution (M-w/M-n = 1.1-1.4) were well controlled for methacrylate monomers up to fairly thigh conversions in many cases. The monomer scope encompassed various functional methacrylates, and their block copolymers were obtained. The feasibility of such a wide range of wavelengths and the fine response to the wavelength are unprecedented features. As a unique application of the wavelength-responsive nature of this system, we demonstrated "One-pot" selective regulation of living radical polymerization and another type of polymerization (ring opening polymerization), Where the regulation Was achieved by simply altering the irradiation wavelength. Facile Operation and applicability to a wide range of polymer designs are advantages of this. polymerization.