Flow Properties of Adhesives

Abstract

Rheology is defined as the study of deformation and flow of matter. In actual practice, its scope is narrower than permitted by this definition. Rheology ordinarily excludes gases, and gives short shrift to Newtonian liquids and Hookean solids. Nonlinear fluids and viscoelastic solids are the systems which are most interesting to rheologists. On a molecular scale, these Theologically interesting materials are composed of molecules or other particles which are very large compared to the atoms or molecules of the elements, yet are small enough to undergo appreciable Brownian movement at ordinary temperatures.