2010复杂流体流变学研讨会资料 韩志超 Generalized Rheometry for Molecular and Structural Dynamics Measurements.pdfVIP

Generalized Rheometry Generalized Rheometry for Molecular and Structural for Molecular and Structural Dynamics Measurements Dynamics Measurements Charles C. Han Charles C. Han Joint Laboratory of Polymer Science and Materials Institute of Chemistry, the Chinese Academy of Sciences 2010 Rheology Meeting of Complex Fluid, ICCAS, Beijing, 9/24-25/2010 Rheology Rheology is the study of the deformation and flow of matter under the influence of an applied perturbation. Response= Function (Perturbation) Perturbation material Normally: input=mechanical perturbation output=mechanical responses But, material responses especially structural responses can be monitored by electrical responses, optical responses, or others For Rouse Model: hydrodynamic interaction is neglected For a more former derivation of Rouse-Zimm Bead-spring Model Read “Modern Theory of Polymer Solutions” by Hiromi Yamakawa Viscoelastic roperties of olymers, J. D. Ferry Linear and Non-Linear Rheological Responses: Examples for Non-Linear systems: • Shear thinning for entangled network (non-Newtonian flow) • Shear banding or fracture • Phase transformations • Shear thickening due to hydrodynamic interaction (colloid system, micro-gel) • Morphological change (such as phase inversion, reaction phase inversion/dynamic vulcanization) • Etc. Optical Rheology : measures responses optically after a mechanical perturbation, such as 1. Scattering (static and dynamic) 2. Birefringence 3. Dichroism 4. Raman scattering 5. Fluorescence 6. Laser Doppler Velocimetry 7. (Time Resolved) Microscopy Become Very Important for Structure Rhe