有哪些信誉好的足球投注网站Network formation in glycerol plasticized wheat gluten as viewed by extensional deformation and stress relaxation Final conclusions.pdfVIP
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Network formation in glycerol plasticized wheat gluten as viewed by extensional deformation and stress relaxation Final conclusions.pdf
ARTICLE IN PRESS
Food Hydrocolloids 22 (2008) 674–681
FOOD
HYDROCOLLOIDS
/locate/foodhyd
Network formation in glycerol plasticized wheat gluten as viewed by extensional deformation and stress relaxation: Final conclusions
Yihu Song?, Qiang Zheng
Department of Polymer Science and Engineering, Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou 310027, China
Received 5 January 2007; accepted 15 February 2007
Abstract
The aim of the present work has been to study the in?uence of rest time on the structural development of gluten/glycerol mixtures with gluten volume fraction ranging from 0.56 to 0.75 by equibiaxial and uniaxial deformations at room temperature. The Gaussian and the Mooney–Rivlin relations are used to evaluate shear moduli at small and medium strains and the Kohlrausch–Williams–Watts (KWW) model is used to analysis relaxation modulus at biaxial strain 0.7. Shear moduli and average relaxation time are discussed in relation to gluten content for the mixtures with a rest time of 150 min and also to a mixture of 0.61 gluten volume fraction with different rest times. r 2007 Elsevier Ltd. All rights reserved.
Keywords: Wheat gluten; Network; Rest; Extensional deformation; Relaxation modulus
1. Introduction
Industrial wheat gluten shows advantage for preparation of biodegradable package ?lms and plastics because of their abundant resources, low cost, good biodegradability and suitable properties (Cherian, Gennadios, Weller, Chinachoti, 1995; Gontard, Guilbert, Cuq, 1992; IrissinMangata, Bauduin, Boutevin, Gontard, 2001; Mangaval et al., 2002; Sanchez, Popineau, Mangavel, Larre, Gueguen, 1998). Wheat gluten containing plasticizer is able to form network upon thermosetting (Cuq, Boutrot, Redl, Lullien-Pellerin, 2000; Mangavel et al., 2004; Pommet, Redl, Guilbert, Morel, 2005; Strecker, Cavalieri, Zollars, Pomeranz, 1995). Glycerol is usually used as a plasticizer to reduce intermolecular for
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