Rheological properties of thermoplastic starch studied by multipass rheometer

Tajuddin, Suzlin, Xie, Fengwei, Nicholson, Timothy M., Liu, Peng and Halley, Peter J. (2011) Rheological properties of thermoplastic starch studied by multipass rheometer. Carbohydrate Polymers, 83 2: 914-919. doi:10.1016/j.carbpol.2010.08.073

Author Tajuddin, Suzlin
Xie, Fengwei
Nicholson, Timothy M.
Liu, Peng
Halley, Peter J.
Title Rheological properties of thermoplastic starch studied by multipass rheometer
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
Publication date 2011-01-10
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2010.08.073
Volume 83
Issue 2
Start page 914
End page 919
Total pages 6
Place of publication Kidlington, Oxford, U.K.
Publisher Pergamon
Collection year 2012
Language eng
Abstract The rheological properties of thermoplastic starch (TPS) melt were investigated using the new multipass rheometer (MPR). This rheometer consists of two servo-hydraulically driven pistons and a fully closed barrel, enabling pressurisation of sample and preventing moisture loss during the process. The starch samples (with different plasticiser contents, 70–110%, and at different glycerol/water ratio, 1:4, 2:3, and 3:2) were first well transformed into TPS in MPR and then tested at different temperatures (90, 110 and 130 ◦C). The TPS behaved as a shear-thinning material, and the power-law model was used to describe its rheological behaviour. The combination of glycerol and water had the greatest influence on the powerlaw index n while temperature had little influence. By mastercurve study, it was shown that the higher the glycerol/water ratio, the stronger the shear-thinning behaviour was. This was explained by interaction between starch and plasticiser and different structural characteristics at different conditions.
Keyword Thermoplastic starch
Multipass rheometer
Capillary rheometry
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 8 September 2010.

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Created: Thu, 22 Sep 2011, 12:43:46 EST by Professor Peter Halley on behalf of Centre for High Performance Polymers