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Quantitative Evaluation of the Swelling and Crosslinking Degrees in Two Organic Gel Packings for SEC
Author(s) -
García Rosa,
Recalde Ileana B.,
Figueruelo Juan E.,
Campos Agustín
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011101)202:17<3352::aid-macp3352>3.0.co;2-c
Subject(s) - swelling , divinylbenzene , polymer , polystyrene , ternary operation , flory–huggins solution theory , solvent , polymer chemistry , copolymer , chemical engineering , size exclusion chromatography , elution , materials science , adsorption , chemistry , chromatography , organic chemistry , composite material , styrene , enzyme , computer science , engineering , programming language
The elution behavior of different solvent/polymer systems has been studied by means of size‐exclusion chromatography (SEC) in two organic column packings based on polystyrene/divinylbenzene (PS/DVB) copolymer, named μ‐styragel and TSK‐Gel H HR . Both packings offer similar characteristics (pore size, particle size, efficiency) but some differences arise when eluting the same systems. The different elution behavior observed in both polymeric gels has been analyzed in terms of their swelling and crosslinking degrees. To evaluate the magnitude of these parameters, a new equation is proposed which has been derived from the Flory‐Huggins theory of swelling equilibrium, and takes into account binary and ternary thermodynamic interaction functions. The equation appropriately predicts the experimental results, showing that the gel that exhibits more solute‐packing attractive interactions (or adsorption as secondary mechanism) is also the one with the highest crosslinking degree or lowest swelling ratio. In this sense, the μ‐styragel column was the most crosslinked polymer network. In addition, the influence of solvent nature, polymer nature, and solute composition on the observed swelling degree has also been compared in both packings.