Abstract
Acrylic acid-acrylamide copolymers were modified in DMSO solution by esterification with polyoxyethylene glycol monomethyl ethers of various chain lengths, via the isourea intermediate (from reaction with dicyclohexylecarbodiimide). A kinetic study shows that both propionic acid (as a model) and high molecular weight copolymers obey a second order law with an activation energy of 86 kJ/mol; the reactivity of the isourea is not dependent on its chain length. The grafted copolymers exhibit different viscometric behaviours in pure water or in CaCl 2 solution, related to the lengths of the graft.
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