流场流分离技术在聚合物相对分子质量分布及微粒分布测定中的应用

Application of Flow Field-Flow Fractionation Techniques to the Characterization of Relative Molecular Mass Distribution and Particle Size Distribution of Polymers

场流分离作为一种新的分析技术,逐渐被用来分离和表征聚合物、生物大分子和聚合物微粒。介绍了作为场流分离技术之一的流场流分离(FlFFF)技术的原理。重点综述了常温FlFFF技术在聚电解质等水溶性聚合物及聚合物乳胶粒水分散体系的分离和表征中的应用,以及高温FlFFF技术在高相对分子质量聚烯烃的分离和表征中的应用。讨论了FlFFF技术相对于GPC技术的优势及目前存在的问题,指出了FlFFF技术在高相对分子质量聚合物分析中的应用前景。

As a new kind of analytical technique, field-flow fractionation has been developed specifically for separating and characterizing polymers, biomacromolecules and polymer particles. The principle of flow field-flow fractionation（F1FFF） as a kind of field flow fractionation are introduced. Application of F1FFF to the separation and characterization of water-soluble polymers such as polyelectrolyte and polymer latex in aqueous system at room temperature and application of F1FFF to the separation and characterization ofpolyolefins with high relative molecular mass at high temperature are reviewed. Both the advantages of F1FFF compared to GPC and the problems in F1FFF are discussed. The future application of F1FFF to polymers with high relative molecular mass is discussed.