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Swelling behavior and metal ion retention from aqueous solution of hydrogels based on N ‐1‐vinyl‐2‐pyrrolidone and N ‐hydroxymethylacrylamide
Author(s) -
Marambio Oscar.G.,
Pizarro Guadalupe del C.,
JeriaOrell Manuel,
Geckeler Kurt E.
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29944
Subject(s) - copolymer , self healing hydrogels , swelling , thermogravimetric analysis , polymer chemistry , aqueous solution , metal ions in aqueous solution , monomer , differential scanning calorimetry , chemistry , polymer , dynamic mechanical analysis , materials science , chemical engineering , nuclear chemistry , metal , organic chemistry , composite material , physics , thermodynamics , engineering
Hydrophilic copolymer gels were prepared by free‐radical copolymerization of 1‐vinyl‐2‐pyrrolidone (NVP) and N ‐hydroxymethyl acrylamide (HMAm). The ratios of both monomers and crosslinker agent (CA) were varied, and the effect of external stimuli such as pH of the swelling media and inorganic ion interaction were investigated. The gels showed a pH‐responsive behavior. The interactions of inorganic ions with the hydrophilic hydrogels were determined as a function of pH, copolymer composition, and variation of the composition crosslinking degree. Additionally, a decrease of the pH of the solution caused a decrease in the equilibrium degree of swelling of the copolymer gels. The capacity to remove several metal ions such as Cu(II), Cr(III), Co(II), Zn(II), Ni(II), Cd(II), and Fe(III) in the aqueous phase was determined by using the liquid‐phase polymer‐based retention (LPR) technique. In addition, the copolymers and their complexes with transition metal ions were characterized by the monomer reactivity ratios by using the Kelen‐Tüdös method, elemental analysis, FTIR and 1 H‐NMR spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. Based on the results of swelling and retention capacity of metal ions of poly(NVP‐ co ‐HMAm), it was concluded that the swelling and retention capacity properties of the hydrogels depends on the reaction environment's pH. This is regarded as a functional hydrogel, which could be employed as biodegradable materials for applications in agriculture chemicals and as drug delivery systems. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009