Premium
pH‐ and Temperature‐Responsive Behavior of Comb‐Type Graft Hydrogels of Poly(acrylic acid) Synthesized Using Gamma Radiation
Author(s) -
Illescas Javier,
Burillo Guillermina
Publication year - 2009
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200900006
Subject(s) - materials science , monomer , acrylic acid , self healing hydrogels , polymerization , polymer , upper critical solution temperature , polymer chemistry , swelling , aqueous solution , chemical engineering , fourier transform infrared spectroscopy , nuclear chemistry , lower critical solution temperature , composite material , copolymer , organic chemistry , chemistry , engineering
Abstract A pH sensitive hydrogel was obtained by γ ‐ray radiation polymerization of AAc in aqueous solution. The temperature sensitive monomer NIPAAm or the same pH sensitive AAc monomer was then grafted to the PAAc hydrogel with gamma radiation. The comb‐type graft polymers obtained net ‐AAc ‐g‐ NIPAAm and the net‐AAc ‐g‐ AAc, have been studied through determination of graft yield and swelling behavior at room temperature. The critical pH value was found between 4.5 and 5.5. An unexpected unique behavior with an UCST has been found around 30–32 °C. Other techniques employed to characterize the comb‐type polymer included DSC, SEM, and FTIR‐ATR.