A polarographic study of propene‐maleic anhydride copolymers

Abstract

The polarographic behaviour of hydrolyzed propene-maleic anhydride copolymers in the interval pH 2.0-1 1 .O has been investigated by differential pulse polarography in aqueous lithium chloride solution at 25 "C. In dependence on the pH-value, one, two or three signals, belonging to the acid groups in the copolymer, appear in the polarograms. Three apparent polarographic acid constants have been determined graphically from the changes in the halfwave potential of the separate peaks in correlation with pH.

Isomerisation of Erythro‐ and Threo‐Succinyl Units in Alternating Alkene‐Maleic Acid Copolymers: A Promising Route to New Microstructures

“…It can be shown that the dissociation behaviour of the erythro-and threo-2,3-disubstituted succinic acid moieties formed, as is also known for low molecular weight 2,3-dialkyl succinic acids, [4] differs significantly, resulting in four different pK A -values for copolymers containing both the erythro-and the threo-form in the backbone. [5,6] This fact should also be of importance for the behaviour of MA copolymers as polyelectrolytes, complexing agents and in biochemical applications.…”

Investigations on the dissociation behavior of hydrolyzed alternating copolymers of maleic anhydride and alkenes:13C-NMR spectra and potentiometric titrations

“…Polarographic measurements on the copolymer with propene evidenced three dissociation steps. 7 For some hydrolyzed alkene-maleic anhydride copolymers the different configurations of the succinic acid moiety can be assigned in the 13C-NMR spectra?-" The chemical shifts of the corresponding signals depend on the degree of neutralization adjusted. Combination of the results of 13C-NMR investigations and potentiometric titrations allows deeper insight into the dissociation behavior of the copolymers investigated.…”