In situ rheometry of concentrated cellulose fibre suspensions and relationships with enzymatic hydrolysis

► We explore the suspending and enzymatic hydrolysis of microcrystalline cellulose, Whatman paper and extruded paper-pulp. ► A methodology to determine on-line viscosity is proposed and validated. ► A structured rheological model is established. ► Suspension viscosity and particle size decreased rapidly during the enzymatic hydrolysis.