Block copolymer assembly via kinetic control
Block copolymer assembly via kinetic control
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DOI：
10.1126/science.1141768
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发表时间：
2007-08-03
期刊：
影响因子：
56.9
通讯作者：
Pochan, Darrin J.
中科院分区：
文献类型：
--
作者：
Cui, Honggang;Chen, Zhiyun;Pochan, Darrin J.
嵌段共聚物由通过共价键连接的两个或更多个化学上不同的聚合物链段或嵌段组成。在溶液中，两亲性嵌段可以由于嵌段之间的能量排斥效应而自组装。排斥的程度，嵌段的长度，和溶剂的选择性主要控制所得的组装形态。在理想情况下，人们希望能够改变形成的形态而不必改变嵌段共聚物的化学性质。通过在溶液中带电的两亲性嵌段共聚物的动力学操纵，我们能够用简单的嵌段共聚物化学产生不同的纳米级结构。该技术依赖于二价有机抗衡离子和溶剂混合物，以驱动嵌段共聚物的组织沿着特定的路径进入复杂的一维结构。嵌段共聚物越来越多地用作模板材料;因此，控制特定图案和结构的形成的能力越来越受到关注和适用性。
Block copolymers consist of two or more chemically different polymer segments, or blocks, connected by a covalent linkage. In solution, amphiphilic blocks can self-assemble as a result of energetic repulsion effects between blocks. The degree of repulsion, the lengths of the block segments, and the selectivity of the solvent primarily control the resultant assembled morphology. In an ideal situation, one would like to be able to alter the morphology that forms without having to change the chemistry of the block copolymer. Through the kinetic manipulation of charged, amphiphilic block copolymers in solution, we are able to generate different nanoscale structures with simple block copolymer chemistry. The technique relies on divalent organic counter ions and solvent mixtures to drive the organization of the block copolymers down specific pathways into complex one-dimensional structures. Block copolymers are increasingly used as templating materials; thus, the ability to control the formation of specific patterns and structures is of growing interest and applicability.