Temperature dependence of the viscosity of highly starch-filled poly(hydroxy ester ether) biodegradable composites |
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Authors: | Genwen Zhou Julious L. Willett Craig J. Carriere |
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Affiliation: | (1) Plant Polymer Research Unit National Center for Agricultural Utilization Research, USDA-ARS 1815 N. University St., Peoria, IL 61604 e-mail: willetjl@mail.ncaur.usda.gov,;(2) Biomaterials Processing Research Unit National Center for Agricultural Utilization Research, USDA-ARS 1815 N. University St., Peoria, IL 61604, |
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Abstract: | The temperature dependence of the viscosity of starch-filled poly(hydroxy ester ether) (PHEE) biodegradable composites was analyzed using Arrhenius and WLF equations. Corn starch/PHEE materials were extruded using a twin screw extruder with starch volume fractions from 0.27 to 0.66. Dynamic strain sweep measurements were carried out at 10 rad/s at six different temperatures from 100 °C to 150 °C. Both Arrhenius and WLF equations model equally well the temperature effect on viscosity of PHEE and starch/PHEE composites with starch volume fractions up to 0.36. Arrhenius equation with stress correction describes the stress dependence of viscosity of starch/PHEE composites with higher starch volume fractions. The activation energy using both Arrhenius equation and Arrhenius equation with stress correction is 62.7 kJ/mol for pure PHEE and starch/PHEE composites. Received: 10 September 1999 Accepted: 27 March 2000 |
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Keywords: | Temperature Viscosity Composite Activation energy Starch Biodegradable Polyester |
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