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Competitive binding of divalent cations to poly(α‐hydroxyacrylic acid)
Author(s) -
Tamura Toru,
Kawabata Noriaki,
Kawauchi Susumu,
Satoh Mitsuru,
Komiyama Jiro
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199808)46:4<353::aid-pi38>3.0.co;2-6
Subject(s) - divalent , selectivity , chemistry , acrylic acid , metal , binding site , inorganic chemistry , polymer chemistry , divalent metal , polymer , monomer , organic chemistry , biochemistry , catalysis
The competitive binding of divalent cations (Mg 2+ , Ca 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ ) on poly(α‐hydroxyacrylic acid) (PHA) and poly(acrylic acid) (PAA) was investigated by equilibrium dialysis. In the Mg/Ca mixed system, binding selectivity for Ca 2+ over Mg 2+ was significantly higher in PHA than in PAA; this was attributed to coordination of α‐OH groups on PHA to Ca 2+ . The binding ability and selectivity for the transition metal cations were almost the same for PHA and PAA at neutral pH, while PHA maintained appreciably higher degrees of binding than PAA in acidic solutions (pH about 3). This cation binding ability of PHA was ascribed to the lower p K a value in the relevant pH region. © 1998 SCI.