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Elongational and shear flow in polymer-clay nanocomposites measured by on-line extensional and off-line shear rheometry

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Abstract

Rheological behaviour of polymer nanocomposites has been usually characterized by rotational as well as capillary rheometry, which are both time and cost consuming. We have already published that reinforcement in polymer-clay nanocomposites can be estimated very fast using extensional rheometer in combination with a capillary rheometer. It has been proven that the magnitude of melt strength can be correlated with that of tensile strength, i.e. 3D physical network made of layered silicate and polymer matrix, which is responsible for material reinforcement, can be monitored directly using extensional rheometry. Therefore, additional time for samples preparation by press or injection moulding as well for long measurements by tensile testing is not required any more. In this contribution, results of extensional rheometry measured directly during compounding process are presented. In this manner, further reduction in time required for material characterization has been achieved. The samples have been prepared by advanced compounding using a melt pump and special screw geometries. With the use of on-line extensional rheometry and off-line rotational rheometry, different nanocomposites have been tested and the effect of processing conditions (screw speed and geometry in the twin-screw extruder) on elongational and viscoelastic properties has been investigated. It has been found that the level of melt strength measured by extensional rheometry correlates with a high accuracy with dynamic rheological data measured by rotational rheometry. It was hereby confirmed that the network structure made of silicate platelets in polymer melt is reflected in both elongational and shear flow in the same way.

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Acknowledgements

This research has been supported by the NanoComp–0901 PlaComp1 Project, which is part of the NanoComp research project cluster founded by Austrian Nanoinitiative.

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Authors and Affiliations

  1. Institute of Polymer Processing, Montanuniversitaet Leoben, Otto Gloeckel-Str. 2, 8700, Leoben, Austria

    Milan Kracalik, Stephan Laske, Andreas Witschnigg & Clemens Holzer

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  1. Milan Kracalik
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  2. Stephan Laske
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  3. Andreas Witschnigg
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  4. Clemens Holzer
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Correspondence to Milan Kracalik.

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Kracalik, M., Laske, S., Witschnigg, A. et al. Elongational and shear flow in polymer-clay nanocomposites measured by on-line extensional and off-line shear rheometry. Rheol Acta 50, 937–944 (2011). https://doi.org/10.1007/s00397-011-0545-2

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  • DOI: https://doi.org/10.1007/s00397-011-0545-2

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