作者: A. Ya. Malkin
DOI: 10.1134/S0965545X09010076
关键词:
摘要: The state of the art in rheology polymer fluids (polymer solutions and melts) filled composites is reviewed. This review includes two parts: analysis basic principles for construction rheological constitutive equations terms continuum mechanics finding correlations between characteristics molecular structure polymers on basis models. Possible approaches to formulation are discussed. Special attention focused correct selection form elastic potential rubbery deformations induced under flow fluids. use a power-law leads best results. To gain unequivocal results minimize number free constants, viscoelastic should be described continuous relaxation spectrum as function limited by maximum time. solve boundary problems selected equation, dynamic stability required, because combination viscosity elasticity controls limits upon shear tensile. Deformation can also lead changes phase system. Furthermore, conditions necessary because, many cases, and, particular, materials tend efficient slip along walls. existing models adequately describe monodisperse polymers; however, passing polydisperse polymers, additional semiempirical required. modern level experimental studies allows test measurements over wide range deformation rates, frequencies, temperatures. However, this field, mainstream tendency concerned with hybrid methods, which combine direct optical observations local its evolution material. In case, various physical applied. recent years, much interest has been studying compositions containing nanosized fillers, able produce their structures melt.