Modeling elongational viscosity and brittle fracture of polystyrene solutions

Abstract Elongational viscosity data of well-characterized solutions 3–50% weight fraction monodisperse polystyrene PS-820k (molar mass 820,000 g/mol) dissolved in oligomeric styrene OS8.8 8800 as reported by André et al. (Macromolecules 54:2797–2810, 2021) are analyzed the Extended Interchain Pressure (EIP) model including effects finite chain extensibility. Excellent agreement between experimental and predictions is obtained, based exclusively on linear-viscoelastic characterization polymer solutions. The were obtained a filament stretching rheometer, at high strain rates lower concentrations, stretched filaments fail rupture before reaching steady-state elongational viscosity. Filament predicted criterion for brittle fracture entangled liquids, which assumes that caused scission primary C-C bonds chains when energy reaches bond-dissociation covalent bond (Wagner al., J. Rheology 65:311–324, 2021).