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Deformation behaviour of homogeneous and heterogeneous bimodal networks
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Algebra and Geometry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
2017 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835Article in journal (Refereed) Submitted
Abstract [en]

In this study, the effect of spatial heterogeneities on the deformation behaviour and ultimate properties of bimodal gels consisting of both short and long chains was investigated by simulating the uniaxial elongation of defect-free networks containing dense short-chain clusters and comparing with gels having a homogeneous distribution of chains. In both cases, the first chains to rupture were the ones already aligned along the strain axis prior to imposing a strain. The presence of clusters was generally not found to improve the ultimate stress or toughness; the short chains within the clusters were effectively shielded from deformation, even at large fractions of short chains. The heterogeneous network tended to be weaker than the corresponding homogeneous network at a given fraction of short chains, fracturing before any signicant deformation of clusters had taken place. The deformation behaviour was, however, found to be sensitive to the degree of heterogeneity and the number of inter-cluster connections. At large fractions of short chains, clustering offered an improvement in the ultimate strain compared to a homogeneous bimodal network and also an equivalent unimodal network with the corresponding number-average chain length, thus providing a small improvement in toughness.

Place, publisher, year, edition, pages
2017.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-332560OAI: oai:DiVA.org:uu-332560DiVA: diva2:1153402
Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2017-10-30
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