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Article Dans Une Revue Polymers Année : 2000

Rheo-mechanical and rheo-optical characterisation of ultra high molecular mass poly(methylmethacrylate) in solution

Résumé

This paper presents rheo-mechanical and rheo-optical experimental characterisation of ultra-high molecular mass poly(methylmethacry-late) in solution. A set of ultra-high molecular mass (up to 2 × 10 7 g=mol† poly(methylmethacrylate), obtained in a previous work by B. Simionescu, was used together with a commercial set of lower molecular mass samples in order to cover two decades of molecular mass range. Two solvents were selected, toluene and N,N-dimethylformamide and the concentration was fixed at 2% (wt/wt). All the measurements were performed at 298K. A complete rheo-mechanical characterisation, both in dynamic mode and in steady shear rate, was performed. In a second step, rheo-optical techniques were able to measure the flow-induced birefringence, dichroism and the associated orientation angles. Using the experimental data obtained in this paper, we have derived the stress optical coefficients and shown that they are independent of shear rate and molar mass. We also explore the normal stress behaviour of the solutions tested.
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Dates et versions

hal-01998487 , version 1 (29-01-2019)

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  • HAL Id : hal-01998487 , version 1

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Ramiro Dell'Erba. Rheo-mechanical and rheo-optical characterisation of ultra high molecular mass poly(methylmethacrylate) in solution. Polymers, 2000. ⟨hal-01998487⟩
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