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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| Institution: | (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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