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Influence of Grafting on the Solution Properties and the Dissociation Behavior of Ionic/Nonionic Grafted Copolymers
Author(s) -
Weber Jens,
Boyko Volodymyr,
Arndt KarlFriedrich
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200600478
Subject(s) - polymer chemistry , maleic anhydride , copolymer , grafting , chemistry , polymer , ethylene glycol , dissociation (chemistry) , ether , potentiometric titration , materials science , organic chemistry , ion
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 Δ G el . Grafting leads to a higher change in free energy Δ G el,1 for the first step but to lower Δ G el,2 required for the second step.