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Comparison of elasticity contributions during the flow of a cellulose derivative solution

Abstract : Three contributions to elasticity (chain entropic contribution, orientational distortion of the director of a nematic phase, interfacial tension) in viscoelastic fluids are compared experimentally using hydroxypropylcellulose (HPC) solutions in water. Elasticity is assessed by measuring the elastic recovery after a simple shear. The entropic contribution to elasticity is measured after shearing an isotropic concentrated solution. The contribution of orientational distortions of the director of a nematic phase to elasticity is measured on HPC-water solutions with HPC concentrations above the isotropic-nematic (or twisted nematic) concentration. Finally, an incompatible blend of HPC-water and polydimethylsiloxane is used to measure the elastic contribution due to an increase of interfacial area. Results show that by far, the elastic recovery of the distortion of a nematic director is much higher than the contribution of the entropic elasticity.
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  • HAL Id : hal-01510993, version 1

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Maria Bercea, Patrick Navard. Comparison of elasticity contributions during the flow of a cellulose derivative solution. Cellulose Chemistry and Technology, Editura Academiei Romane, 2016, 50 (5-6), pp.601-607. ⟨hal-01510993⟩

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