On the theory of polymer adsorption at an interface

Abstract

SYNOPSISExact results arc given for the grand partition function of a single modcl chain adsorbed at an interface. Thc model chosen corresponds to a walk on a 5-choice, instead of a 6-choice, simple cubic lattice by disallowing step rcversals. The flexibility of this model is rendered variable by assigning different weights to consecutive steps made in the same direction. The obtained results are compared to those of a previous model for Gaussian chains. Satisfactory agreement between the models allows the previously undetermined flexibility parameter to be determincd. The segment density in the vicinity of the interface is obtained as a function of this parameter. Correspondence with polymer chains is established through this parameter. We conjecture that the volume fraction of segments in the diffuse layer resulting from the loops does not cxcecd 0.1, even when the volume fraction i n the interface is unity.

An adsorption study of gelatin onto the Fuller's earth surfaces

“…The situation when a large molecule contacts a solid surface has been theoretically quantified in many ways to give numerous theories of macromolecular adsorption 20–22. According to the proposed adsorption models, the adsorption of a large molecule on a solid surface occurs via a three‐step mechanism: Transport of molecules towards the surface from the bulk of the protein solution. Attachment of molecules at the active sites of the surface. Change in the conformation of the adsorbing macromolecule. …”