Liu Xu, Wang Chen-Gang, Goto Atsushi
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore, Singapore.
Angew Chem Int Ed Engl. 2019 Apr 16;58(17):5598-5603. doi: 10.1002/anie.201814573. Epub 2019 Mar 22.
Molecular weight distribution of polymers, termed dispersity (Đ), is a fundamental parameter for determining polymer material properties. This paper reports a novel approach for controlling Đ by exploiting a temperature-selective radical generation in organocatalyzed living radical polymerization. The polymers with tailored Đ were synthesized in a batch system without the assistance of an external pump. A unique aspect of this approach is that Đ was tuneable from 1.11 to 1.50 in any segment in diblock, triblock, and multiblock copolymers and in any form of star and brush polymer without segmental or topological restriction. This approach is amenable to various monomers and free from metals and thus attractive for applications. The approach also generated polymer brushes on surfaces with tailored Đ. An interesting finding was that the polymer brushes exhibited unique interaction with external molecules, depending on the Đ value.
聚合物的分子量分布，称为分散度（Đ），是决定聚合物材料性能的一个基本参数。本文报道了一种通过在有机催化活性自由基聚合中利用温度选择性自由基生成来控制分散度的新方法。在没有外部泵辅助的间歇系统中合成了具有定制分散度的聚合物。这种方法的一个独特之处在于，在二嵌段、三嵌段和多嵌段共聚物的任何链段以及星形和刷状聚合物的任何形式中，分散度可在1.11至1.50之间调节，且不受链段或拓扑结构的限制。这种方法适用于各种单体，且不含金属，因此在应用方面具有吸引力。该方法还能在表面生成具有定制分散度的聚合物刷。一个有趣的发现是，聚合物刷根据分散度值与外部分子表现出独特的相互作用。
