有机流动相下高分子材料的非对称场流分离

Separation of Polymers Using Asymmetric-fl ow Field Flow Fractionation in Organic Solvent

非对称场流分离技术没有固定相、分离压力小,与传统的凝胶渗透色谱相比具有天然优势,可以作为高分子材料表征的有效手段。但由于膜的相容性问题,场流技术一般运用于水相体系,很少用于有机相体系中。本文探索了不同半透膜在有机场流分离中的应用情况,摸索了有机体系下非对称场流的条件,成功在有机溶剂中分离了聚甲基丙烯酸甲酯和聚丙烯腈两种高分子材料。

Asymmetric-flow field flow fractionation is a separation technology which doesn't have a packed stationary phase and with low pressure inside the channel,which brings nature advantages compared with traditional gel permeation chromatography technology.But due to its poor compatibility with organic solvents,field flow fractionation is generally used in aqueous system rather than organic system.In this paper,we studied the compatibility of semipermeable membrane in different organic eluents,explored the methods when using field flow fractionation in organic system,and successfully separated polymethylmethacrylate and polyacrylonitrile in organic elution.