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Viscoelasticity in polymer films on rigid substrates
KTH, Superseded Departments, Polymer Technology.ORCID iD: 0000-0003-3201-5138
KTH, Superseded Departments, Polymer Technology.ORCID iD: 0000-0002-9372-0829
2003 (English)In: Macromolecular materials and engineering (Print), ISSN 1438-7492, E-ISSN 1439-2054, Vol. 288, no 2, 108-116 p.Article in journal (Refereed) Published
Abstract [en]

The viscoelasticity of two thermally crosslinked polymer coatings was examined in terms of relaxation of the applied stress after a sudden strain. Two different transient methods were utilized: flat-ended cylindrical indentation testing of polymer film on a rigid substrate and tensile testing of a corresponding free-standing polymer film. The correlation between tensile and indentation tests was studied. The mechanical response of a viscoelastic layer deposited on a rigid substrate was investigated as a function of indentation depth. there was good agreement between the results of the tensile and indentation tests for thick film layers at moderate indentation depths. The findings indicate that the substrate influences the coating performance by reducing the viscous contribution to the stress response hand amplifying the magnitude of the equilibrium modulus for large indentation depths. The indentation method utilized here was shown to be a potentially suitable tool for the determination of Poisson's ratio of polymer films.

Place, publisher, year, edition, pages
2003. Vol. 288, no 2, 108-116 p.
Keyword [en]
flat-ended indentation, Poisson's ratio, substrate influence, tension, uniaxial, viscoelastic properties, layered specimen, indentation, nanoindentation, microindentation, microhardness, coatings, indenter
Identifiers
URN: urn:nbn:se:kth:diva-22400ISI: 000182047600002OAI: oai:DiVA.org:kth-22400DiVA: diva2:341098
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Johansson, Mats K. G.Hult, Anders

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