New Interpretation of Shear Thickening in Telechelic Associating Polymers

摘要: Shear thickening of telechelic associating polymers, particularly hydrophobically modified ethoxylated urethanes (HEURs), is classically attributed to either non-Gaussian behavior the chains, also called finite extensible nonlinear elasticity (FENE), or flow-enhanced formation network strands; however, in a recent paper [Macromolecules, 45, 888 (2012)], Suzuki et al. show that neither previously mentioned interpretations can hold true, as they find shear while at same time structure has essentially remained equilibrium one, except for fact reassociation strands continuously detach from it anisotropically enhanced gradient direction. In present paper, we propose different mechanism might explain thickening, namely, stress contribution arising repulsive interaction between flowerlike micelles are forced interpenetrate one another by flow. support thi...