The surface of regenerated cellulose membranes were modified by irreversible adsorption of carboxymethylcellulose (CMC). Pairs of wet CMC-modified membranes were laminated with polyvinylamine (PVAm) at room temperature and the delamination force for wet membranes was measured for both dried and never-dried laminates. The wet adhesion was studied as a function of molecular weight, amine content of and adsorption pH for the PVAm. Surprisingly the PVAm-CMC system gave substantial wet adhesion for both the dried and never-dried laminates.  The greatest adhesion was achieved for fully hydrolyzed high molecular weight PVAm. Bulk carboxymethylation of cellulose membranes gave inferior wet adhesion combined with PVAm compared to CMC adsorption which indicates that a thick CMC layer was necessary. There are no obvious covalent crosslinking reactions between CMC and PVAm at room temperature and we are instead attributing the wet adhesion to interdigitation of PVAm chains into the CMC layer where polymer entanglements and specific interactions between the two polymers contribute to the wet adhesion.

Polyelectrolyteinterdigitation across interfaces and wet adhesion: Influence of polyvinylamine on wet adhesion between cellulose model surfaces modified with carboxymethylcellulose

249th National Meeting (2015)

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