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Liquid chromatography techniques for characterizing poly(Vinyl Alcohol)
Author(s) -
Meehan Elizabeth,
Reid Simon P.,
Samios Eleftherios,
Dawkins John V.
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961100106
Subject(s) - vinyl alcohol , elution , chromatography , polystyrene , size exclusion chromatography , hydrolysis , tetrahydrofuran , aqueous solution , electrolyte , molar mass distribution , chemistry , copolymer , gel permeation chromatography , methanol , materials science , organic chemistry , solvent , polymer , electrode , enzyme
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.