RheoDSC: design and validation of a new hybrid measurement technique |
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Authors: | Vincent Janssens Christophe Block Guy Van Assche Bruno Van Mele Peter Van Puyvelde |
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Affiliation: | (1) Department of Chemical Engineering, Applied Rheology and Polymer Processing, Leuven Material Research Centre, Katholieke Universiteit Leuven, W De Croylaan 46, 3001 Leuven, Belgium;(2) Department of Materials and Chemistry-Physical Chemistry and Polymer Science, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium; |
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Abstract: | A newly developed hyphenated technique is presented that combines an existing rheometer and differential scanning calorimeter (DSC) into a single experimental setup. Through the development of a fixation accessory inside the cell of the calorimeter and the introduction of an add-on unit for the rheometer, the simultaneous calorimetric and rheological measurement inside the well-controlled thermal environment of a Tzero™ DSC cell opens new experimental possibilities. The evolution of thermal and flow properties of a material can be simultaneously monitored during steady or oscillatory shear flow and regular or modulated temperature DSC measurements. The technique offers interesting opportunities for the investigation of flow-induced transitions, such as crystallization or phase separation, and provides a possibility for high-throughput screening of materials. The signal quality of the novel technique in comparison to the stand-alone techniques is demonstrated by the evaluation of the calibration factors and by measurements on standard materials. Finally, combined rheological and calorimetric melting and crystallization experiments on polycaprolacton are performed. |
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