Abstract
Dynamics of associating polymer solutions above the reversible gelation point are studied. Each macromolecule consists of a soluble backbone (B) and a small fraction of specific strongly interacting groups (A or C stickers) attached to B. A mixture of B–A and B–C associating polymers with 1:1 stoichiometric ratio is considered. As a result of AC association, the polymers reversibly gelate above the overlap concentration. It is shown that (1) the network strands are linear complexes (double chains) of B–A and B–C; (2) “diffusion” of the network junction points is characterized by an apparent activation energy, which can be significantly higher than the energy of one AC bond; (3) most importantly, the randomness of sticker distribution along the chain can significantly slow down the network relaxation leading to a markedly non-Maxwellian viscoelastic behavior. The theory elucidates the most essential features of rheological behavior of polysaccharide associating systems (with A = adamantyl moiety, C = β-cyclodextrin, B = either chitosan or hyaluronan) including similar behavior of G ′ and G ″ in a wide frequency range, strong temperature dependence of the characteristic frequency ω x , and an extremely strong effect of added free stickers (fC) on the dynamics.
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Semenov, A., Charlot, A., Auzély-Velty, R. et al. Rheological properties of binary associating polymers. Rheol Acta 46, 541–568 (2007). https://doi.org/10.1007/s00397-006-0149-4
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DOI: https://doi.org/10.1007/s00397-006-0149-4