The behaviour of membranes between electrolyte solutions : III. The dissociation of carboxyl groups in cellulose
article
Former work (I and II) led to the conclusion that the membrane diffusion potential at cellulose membranes must be connected with the degree of dissociation of acid groups in the membrane. In this communication the dissociation of carboxyl groups in cellulose is investigated with the aid of "neutralization curves".
Investigating cellulose material into which carboxyl groups had been introduced (oxycellulose), it appeared that the carboxyl groups occur in a reactive and an unreactive form, which are interconvertible. The unreactive carboxyl groups are assumed to be present in an anhydride form. If care is taken that the carboxyl groups are present in the reactive form, they can be titrated, and well‐defined neutralization curves can be obtained. Neutral salts greatly influence the titrations. Shape and position of the neutralization curves depend on the content of carboxyl groups in the material. — The law of mass action and the Donnan equilibrium as commonly formulated are not sufficient to explain shape and position of the neutralization curves, nor is it clear in what way they are connected with the membrane diffusion potentials.
Investigating cellulose material into which carboxyl groups had been introduced (oxycellulose), it appeared that the carboxyl groups occur in a reactive and an unreactive form, which are interconvertible. The unreactive carboxyl groups are assumed to be present in an anhydride form. If care is taken that the carboxyl groups are present in the reactive form, they can be titrated, and well‐defined neutralization curves can be obtained. Neutral salts greatly influence the titrations. Shape and position of the neutralization curves depend on the content of carboxyl groups in the material. — The law of mass action and the Donnan equilibrium as commonly formulated are not sufficient to explain shape and position of the neutralization curves, nor is it clear in what way they are connected with the membrane diffusion potentials.
Topics
TNO Identifier
49643
DOI
https://doi.org/10.1002/recl.19520710602
Source
Recueil des Travaux Chimiques des Pays‐Bas, 71(6), pp. 525-544.
Pages
525-544
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