12/3/2010
Synthesis and swelling properties of pH- and temperature-sensitive interpenetrating polymer networks composed of polyacrylamide and poly(γ-glutamic acid)
( 3531–3537)Journal of Applied Polymer  Science 119 #6 (2010)
Rodríguez-Félix et al crosslinked both polymers separately reducing the potential loss of a polymer during the washing process.  All of the hydrogels swelled rapidly and reached equilibrium in an average time of 40 min.  (RDC 12/9/2010)