Properties of a plasticised starch blend. Part 1: Influence of moisture content on fracture properties

Chaleat, C., Halley, P. J. and Truss, R. W. (2008) Properties of a plasticised starch blend. Part 1: Influence of moisture content on fracture properties. Carbohydrate Polymers, 71 4: 535-543. doi:10.1016/j.carbpol.2007.06.029


Author Chaleat, C.
Halley, P. J.
Truss, R. W.
Title Properties of a plasticised starch blend. Part 1: Influence of moisture content on fracture properties
Journal name Carbohydrate Polymers   Check publisher's open access policy
ISSN 0144-8617
Publication date 2008-04-07
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.carbpol.2007.06.029
Open Access Status
Volume 71
Issue 4
Start page 535
End page 543
Total pages 9
Editor J. F. Kennedy
J. R. Mitchell
W. J. Orts
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
291500 Biomedical Engineering
670704 Plastics in primary forms
090399 Biomedical Engineering not elsewhere classified
9611 Physical and Chemical Conditions of Water
0904 Chemical Engineering
Abstract The effect of moisture content on tensile and fracture properties of a plasticised starch/high molecular weight polyol blend was investigated. A wide range of mechanical behaviour was achieved by varying slightly the water uptake of this material. At low moisture content, the Young's modulus was 3800 MPa and the yield stress, 54 MPa. When the moisture content reached 15 wt%, their values dropped, respectively, to around 1500 MPa and 21 MPa. As the material behaviour varies greatly over the moisture content range, two fracture mechanics techniques were employed: the linear elastic fracture mechanics approach to characterise brittle behaviour and the essential work of fracture method to investigate a more ductile material. At low moisture content, the measured strain energy release rate at fracture, J(Q) was very low and showed little dependency on the moisture content. As the moisture content increases, the material becomes increasingly ductile and displayed a brittle-to-ductile transition at 12% of moisture content, which corresponded to the glass transition temperature of the added polyol. (c) 2007 Elsevier Ltd. All rights reserved.
Keyword Fracture behaviour
Moisture content
Plasticised starch
Starch blend
Tensile properties
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Tue, 31 Mar 2009, 23:05:45 EST by Sally Beard on behalf of Faculty Of Engineering, Architecture & Info Tech