‘Ductile’ mixed biopolymer gel composites

The deformation and failure behaviour of novel ‘pseudo-ductile’ gelatin/maltodextrin mixed biopolymer gels have been assessed using dynamic mechanical tests, conducted on the stage of a confocal laser scanning microscope. These materials exhibit a phase-separated structure, with spherical maltodextr...

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Bibliographic Details
Published in:Polymer (Guilford) 2000, Vol.41 (6), p.2319-2323
Main Authors: Plucknett, K.P, Normand, V, Pomfret, S.J, Ferdinando, D
Format: Article
Language:English
Subjects:
Applied sciences
Biopolymer gel composites
Deformation
Ductility
Exact sciences and technology
Failure analysis
Gelatin
Gels
Inclusions
Interfaces (materials)
Maltodextrin
Microscopic examination
Natural polymers
Nonmetallic matrix composites
Phase separation
Physicochemistry of polymers
Starch and polysaccharides
Tensile testing
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Summary:The deformation and failure behaviour of novel ‘pseudo-ductile’ gelatin/maltodextrin mixed biopolymer gels have been assessed using dynamic mechanical tests, conducted on the stage of a confocal laser scanning microscope. These materials exhibit a phase-separated structure, with spherical maltodextrin-rich inclusions within a continuous gelatin-rich matrix. Using both conventional tension and notched compact tension tests, it was observed that the apparent ductility was due to inclusion/matrix interfacial debonding, resulting in reduced elastic modulus. Based upon a simple debonding model, an interfacial fracture energy of ∼0.25 J m −2 was determined.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(99)00602-3