Anisotropic frequency response of critical density fluctuation of NIPA gel under oscillation shear

摘要

A relation between theology and structure of high density NIPA gel around a critical point on volume phase transition was studied by a simultaneous rheology and small-angle neutron scattering measurement. Just below the critical temperature, the NIPA gel showed softening: G' and G '' get closer (G'> C'). At this temperature, the density fluctuation enhanced along the shear direction corresponding to the shear frequency but not to the shear strength. It means that this anisotropy is different from that observed in a statically stretched gel. (c) 2006 Elsevier B.V. All rights reserved.