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Interactions between polyelectrolytes. DEAE‐sephadex–polymethacrylic acid
Author(s) -
Feitelson J.,
Josephs R.
Publication year - 1963
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.360010405
Subject(s) - polyelectrolyte , chemistry , polymer , enthalpy , endothermic process , charge density , molecule , polymer chemistry , chromatography , thermodynamics , organic chemistry , adsorption , physics , quantum mechanics
The interaction between a highly swollen polyelectrolyte and a polymer coil‐of low charge density was investigated. Diethylaminoethyl dextran (DEAE) and polymethacrylic acid (PMA) at low pH served as a model system. Distribution measurements of PMA between a DEAE resin and ambient solution showed that the interaction increased with pH (number of charges per PMA molecule), temperature, and molecular weight of PMA. Since the absorption of PMA in the polyelectrolyte phase is an endothermic process it must be accompanied by a large positive entropy increase. The latter was sought in the structural changes of water which occur in the vicinity of the interacting polymers. The magnitude of the enthalpy changes for two PMA fractions indicate that not only interactions between ionized groups but also nonpolar and even purely polymer effects should be considered in this system.