Abstract
A new size exclusion chromatography (SEC) system for nylon-6 has been developed which uses the universal calibration peak retention of narrow dispersity poly(methyl methacrylate) (PMMA) in 2,2,2-trifluoroethanol (TFEtOH). The SEC system, operated at room temperature with silanized silica columns, obviates the solvent incompatibility of TFEtOH with styrene-gel packings and gives simple and reproducible chromatograms of polyamide-6. The method provides molecular weight accuracy within ±10% without correction for dispersion. To support the universal calibration for nylon-6, it was necessary to investigate the macromolecular hydrodynamics of PMMA in TFEtOH; results are represented well by the Stockmayer-Fixman viscosity-molecular weight theory. Poly(methylmethacrylate) in TFEtOH exhibits a Mark-Houwink exponent of 0.88 and a polymer-solvent interaction parameter, χ 12 equal to 0.38.
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