Poly(vinyl alcohol) (PVOH) samples may contain several heterogeneities requiring the development of chromatographic techniques for characterization. Size exclusion separations have been carried out using a number of aqueous eluents, incorporating electrolyte, or electrolyte/organic modifier, or surfactant. The most favourable molecular size separation was obtained using 0.25% w/v sodium lauryl sulfate as eluent. Reasonable values for molecular weights of PVOH samples have been determined. Compositional distributions in copolymer systems can be assessed using high‐performance liquid chromatography employing a reversed‐phase separation mechanism. For poly(vinyl alcohol), gradient elution with water/tetrahydrofuran (THF) with a wide pore polystyrene‐based packing produced separations dependent on degree of hydrolysis and sequence length distribution. The elution results were verified with a column packed with non‐porous beads. Partially hydrolysed PVOH samples appeared to have a broad distribution of composition.
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Meehan et al. (1996) studied this question.
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