The synthesis and first experiments on the rheological behaviour of poly(acrylamide) (PAAm) grafted with poly(ethylene oxide-co-propylene oxide) are presented. Well-defined, water-soluble graft copolymers were prepared in high yields by grafting poly(oxyalkylene) monoamines onto partly hydrolysed PAAm. Reversible gelation of aqueous graft copolymer solutions (c > c* = 1/[n]) was observed in 0.5 M K2CO3 at elevated temperatures, accompanied by viscosity changes of almost three orders of magnitude between 80 and 85°C at low shear rates. The observed phenomena are explained in terms of the formation of secondary bonds or association between the grafts.
de Vos, S., de Vos, S. C., Moller, M., Möller, M., Visscher, K., Mijnlieff, P. F., ... Mijnlieff, P. F. (1994). Synthesis and characterization of polyacrylamide-graft-poly(ethylene oxid-copropyleneoxide). Polymer, 35(12), 2644-2650. https://doi.org/10.1016/0032-3861(94)90393-X