Linear and nonlinear shear rheology of nearly unentangled H-polymer melts and solutions

Abstract We investigate the linear and nonlinear shear rheology of a marginally entangled H-polymer melt two solutions made by diluting high molecular weight H-polymers in oligomer. In order to approach nearly unentangled state, dilution is conducted at volume fractions such that attain similar number entanglements melt. Start-up experiments demonstrate behavior analogous with comparable span chain length. Concerning solutions, increase elasticity fast flows, coupled lesser role monomeric friction reduction, allows strong stretch start-up tests. As result, transient strain hardening occurs. Furthermore, failure Cox-Merz rule observed for which indicates they better conform FENE-Rouse compared melts.