The Influence of Shear Rate on the Kinetics of Formation of Thermoplastic Polyurethane
Publish place: 9th National Iranian Chemical Engineering Congress
Publish Year: 1383
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
NICEC09_179
تاریخ نمایه سازی: 14 فروردین 1386
Abstract:
In this paper the rheokinetics of polyurethane formation and the influence of shear rate on its kinetics have been studied. Two different linear polyurethane systems with 0% and 100% hard segments are examined in a cone and plate rheometer. The isothermal increase of viscosity during polyurethane formation has been measured at different shear rates and different temperatures and is modeled with an exponential function.
The molecular weight vs. time curves and the reaction kinetic constants have been obtained for various shear rates and temperatures using gel permeation chromatography (GPC). It was concluded that kinetics of polyurethane formation is enhanced as the shear rate is increased. Phase separation is found to be responsible for irregularities in the viscosity build up due to formation of polyurethane with hard segments at high conversions.
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Authors
Navarchian
Department of Chemical Engineering, University of Isfahan, ۸۱۷۴۶-۷۳۴۴۱, Isfahan, Iran
Picchioni
Department of Chemical Engineering, University of Groningen, ۹۷۴۷AG, Groningen, The Netherlands
Janssen
Department of Chemical Engineering, University of Groningen, ۹۷۴۷AG, Groningen, The Netherlands
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