Influence of Grafting on the Solution Properties and the Dissociation Behavior of Ionic/Nonionic Grafted Copolymers

Abstract

A new synthetic approach towards grafted terpolymers based on a poly[(methyl vinyl ether)‐alt‐(maleic anhydride)] backbone and poly(ethylene glycol) monomethyl ether (MPEG) side chains is presented. Resulting comb polymers with controllable grafting degree still have highly reactive anhydride moieties along the polymer backbone, as proved by IR spectroscopy. Grafting degree depends on the anhydride hydroxide stoichiometric ratio. It is not influenced by the molecular weight of MPEG. An increase in the grafting degree leads to a contraction of the polymer in the solution. Evaluation of potentiometric titration data gave a deeper insight into the dissociation process. The copolymers showed a two‐step dissociation behavior. No significant influence of the grafting degree on the acidic strength was observed, whilst there is a strong effect of the grafting degree on the free energy change upon neutralization ΔGel. Grafting leads to a higher change in free energy ΔGel,1 for the first step but to lower ΔGel,2 required for the second step.magnified image

Poly(methyl vinyl ether‐alt‐maleic anhydride) functionalized with 3‐aminophenylboronic acid: A new boronic acid polymer for sensing diols in neutral water

“…Poly(MVE‐ alt ‐MA) is known to react with amines or alcohols to produce polymers with functional side chains. Nevertheless, not all anhydride groups undergo amidation or alcoholysis and even under excess of amine or alcohol some of them remain unreacted . To assess how many functional groups were introduced into polymer structure it is necessary to use additional experimental techniques.…”

“…Nevertheless, not all anhydride groups undergo amidation or alcoholysis and even under excess of amine or alcohol some of them remain unreacted. 44,45 To assess how many functional groups were introduced into polymer structure it is necessary to use additional experimental techniques. that statistically there is one anhydride group that has undergone amidation reaction per three unreacted anhydride groups.…”