Development and testing of a new pressure cell for rheological characterisation of polymer melts

Krebs, Mathias; Wünsch, Olaf

doi:10.3933/applrheol-20-23229

2010

DOI: 10.3933/applrheol-20-23229

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Development and testing of a new pressure cell for rheological characterisation of polymer melts

Mathias Krebs

Olaf Wünsch

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2012

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Viscoelastic properties of solutions of polystyrene melts and carbon dioxide: Analysis of a transient shear rheology approach

Handge¹,

Altstädt²

2012

Journal of Rheology

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In this work, the viscoelastic, thermal and diffusion properties of solutions of polystyrene melts and carbon dioxide (CO 2) were analyzed using plate-plate rheometry in the transient mode. The objective of this study was to evaluate a transient shear rheology approach for high viscosity polymer melts, to verify superposition principles for polystyrene/CO 2 solutions and to measure the glass transition temperature as a function of pressure and CO 2 concentration. Two different procedures of saturating polystyrene with carbon dioxide were applied, i.e. loading with the blowing agent below the glass transition temperature of polystyrene and at the measurement temperature. Stress-growth experiments in shear were performed in order to measure the transient viscosity of polystyrene/CO 2 solutions in the linear regime. A shift of the transient viscosity data to a mastercurve was applied in order to determine the shift factor of the viscosity and the average relaxation time. Our data indicate that the steady-state viscosity and the average relaxation time are proportional to the temperature-pressure-concentration shift factor a T,p,c within experimental scatter, and consequently a time-temperature-pressureconcentration superposition principle holds for polystyrene/CO 2 solutions. Whereas the viscosity of polystyrene strongly depends on the applied temperature and pressure, the elastic equilibrium compliance depicts only a weak dependence on temperature and pressure.

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Viscoelastic properties of solutions of polystyrene melts and carbon dioxide: Analysis of a transient shear rheology approach

Handge¹,

Altstädt²

2012

Journal of Rheology

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show abstract

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Development and testing of a new pressure cell for rheological characterisation of polymer melts

Cited by 1 publication

References 0 publications

Viscoelastic properties of solutions of polystyrene melts and carbon dioxide: Analysis of a transient shear rheology approach

Viscoelastic properties of solutions of polystyrene melts and carbon dioxide: Analysis of a transient shear rheology approach

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