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The influence of interfacial mechanical behaviour upon deformation and fracture of composite biopolymer gels

Published online by Cambridge University Press:  01 February 2011

K.P. Plucknett ,
V. Normand ,
S.J. Pomfret ,
D. Ferdinando ,
W.J. Frith  and
I.T. Norton
K.P. Plucknett
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
V. Normand
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
S.J. Pomfret
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
D. Ferdinando
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
W.J. Frith
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
I.T. Norton
Affiliation:
Unilever Research, Colworth Laboratory, Sharnbrook, Bedfordshire, MK44 1LQ, UK
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Abstract

Confocal Laser Scanning Microscopy (CLSM) has been used to follow the dynamic structure evolution of two protein/polysaccharide mixed biopolymer gel systems during large strain deformation. Gelatin/maltodextrin composites exhibited a ‘;pseudo-yielding’ stress-strain response in both tension and compression, when the gelatin-rich phase is continuous, which was attributed to debonding of the particle/matrix interface. This behaviour was significantly less apparent for gelatin/agarose mixed gels. The interfacial fracture energy of the two systems was determined using an elastomer composite debonding model. The gelatin/maltodextrin interfacial fracture energy (∼0.2 J.m-2) was found to be an order of magnitude less than for gelatin/agarose, leading to the observed variation for the two systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF7.2
Copyright
Copyright © Materials Research Society 2000

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References

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