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Thermal behavior and network structure of poly( N ‐vinyl‐2‐pyrrolidone‐crotonic acid) hydrogels prepared by radiation‐induced polymerization
Author(s) -
Çaykara Tuncer,
Kantoğlu Ömer
Publication year - 2004
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.423
Subject(s) - self healing hydrogels , swelling , materials science , thermogravimetric analysis , differential scanning calorimetry , polymer chemistry , polymerization , 2 pyrrolidone , chemical engineering , ethylene glycol , polymer , solvent , flory–huggins solution theory , volume (thermodynamics) , interpenetrating polymer network , composite material , thermodynamics , chemistry , organic chemistry , physics , engineering
Poly( N ‐vinyl‐2‐pyrrolidone‐crotonic acid) [P(VP/CrA)] hydrogels were prepared by irradiating the ternary mixture of VP/CrA and crosslinking agent ethylene glycol dimethacrylate (EGDMA) in water by γ rays at ambient temperature. Differential scanning calorimetry and thermogravimetric analysis were performed to evaluate the thermal properties of ionized networks and to establish if they showed thermal differences that could be related to the CrA content in the gel system. The volume swelling ratio of P(VP/CrA) hydrogels were investigated as a function of the pH in the immersing solution. The volume swelling ratio of these hydrogels increased with an increase in pH and a decrease CrA content in the hydrogel. The volume swelling ratio of the hydrogels was also evaluated using an equation, based on the Flory—Huggins thermodynamic theory, the phantom network theory of James–Guth and Donnan theory of swelling of weakly charged ionic gels for determination of the molecular weight between crosslinks $(\bar{M}_{{\rm c}})$ and the polymer–solvent interaction parameter (χ). Copyright © 2004 John Wiley & Sons, Ltd.