嵌段共聚物的临界条件液相色谱分离与表征

Separation and Characterization of Block Copolymers by Liquid Chromatography at the Critical Condition

嵌段共聚物是由两种或两种以上不同性质的聚合物链段通过共价键连接形成的特殊聚合物。它可以结合构成嵌段的不同种类聚合物的性质,得到性能比较优越的功能性聚合物材料,因此越来越受到人们的重视。然而,嵌段共聚物的分离和表征一直都是一项颇具挑战性的工作。临界条件液相色谱(liquid chromatography at the critical condition,LCCC)作为一种新型的液相色谱分离技术,可以使嵌段共聚物中的某种嵌段处于"色谱不可见"(chromatographic invisible)状态,不会影响整个聚合物的保留时间,从而根据嵌段共聚物中其他嵌段长度来分离嵌段共聚物。本文介绍了LCCC分离法的分离原理与实现途径,较为系统地综述了LCCC分离表征嵌段共聚物的近期研究进展,并对该方法目前存在的问题及今后发展前景进行了探讨。

Block copolymer is a special type of copolymer in which two or more segments of polymers（ blocks） are joined together by covalent bond. It has received more and more attention because it can combine the excellent properties from different polymers into an excellent functional polymer material. How ever,it is still a challenging task to separate and characterize the block copolymers. As a new type of chromatographic technique, liquid chromatography at the critical condition（ LCCC） can make a block of the block copolymer ＂chromatographically invisible＂at the critical condition of the corresponding homopolymer,so that the retention of the block copolymer is determined solely by the other block that is not under critical condition. In this review, the mechanism and approach of LCCC technique are introduced. The recently studies for LCCC analysis of block copolymer are systemically review ed. The limitation and future development of LCCC method are also discussed.