Abstract
Thermal field-flow fractionation (ThFFF) is applied to the characterization of vinyl polymers such as poly(vinylcyclohexane) (PVCH) in terms of size, molar mass and chemical composition. It is shown by 1H NMR that, although limited, ThFFF using single component solvents can separate polystyrene (PS) and its hydrogenated product, PVCH, according to differences in molecular microstructure. Different from single component solvents, binary solvent systems of cyclohexane and methyl ethyl ketone can provide an additional driving force (in the form of solvent partitioning) to dramatically improve the separation of PS and PVCH by ThFFF. It is found that the separation of PS and PVCH improves with increasing methyl ethyl ketone content in the mobile phase up to 30 vol %. Additionally, it is shown that the compositional distribution of PVCH in the binary solvent systems can be obtained by the online coupling of infrared spectroscopy to ThFFF.
Published Version
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