Determination of the linear coefficient of thermal expansion in polymer films at the nanoscale: influence of the composition of EVA copolymers and the molecular weight of PMMA

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dc.contributor.author González Benito, Francisco Javier
dc.contributor.author Castillo, E.
dc.contributor.author Cruz Caldito, J. F.
dc.date.accessioned 2020-11-17T13:09:21Z
dc.date.available 2020-11-17T13:09:21Z
dc.date.issued 2015-01-01
dc.identifier.bibliographicCitation González-Benito, J., Castillo, E. and Cruz-Caldito, J.F (2015). Determination of the linear coefficient of thermal expansion in polymer films at the nanoscale: influence of the composition of EVA copolymers and the molecular weight of PMMA. Phys. Chem. Chem. Phys., 2015,17, 18495-18500
dc.identifier.issn 1463-9076
dc.identifier.uri http://hdl.handle.net/10016/31434
dc.description.abstract Nanothermal-expansion of poly(ethylene-co-vinylacetate), EVA, and poly(methyl methacrylate), PMMA, in the form of films was measured to finally obtain linear coefficients of thermal expansion, CTEs. The simple deflection of a cantilever in an atomic force microscope, AFM, was used to monitor thermal expansions at the nanoscale. The influences of: (a) the structure of EVA in terms of its composition (vinylacetate content) and (b) the size of PMMA chains in terms of the molecular weight were studied. To carry out this, several polymer samples were used, EVA copolymers with different weight percents of the vinylacetate comonomer (12, 18, 25 and 40%) and PMMA polymers with different weight average molecular weights (33.9, 64.8, 75.600 and 360.0 kg mol(-1)). The dependencies of the vinyl acetate weight fraction of EVA and the molecular weight of PMMA on their corresponding CTEs were analyzed to finally explain them using new, intuitive and very simple models based on the rule of mixtures. In the case of EVA copolymers a simple equation considering the weighted contributions of each comonomer was enough to estimate the final CTE above the glass transition temperature. On the other hand, when the molecular weight dependence is considered the free volume concept was used as novelty. The expansion of PMMA, at least at the nanoscale, was well and easily described by the sum of the weighted contributions of the occupied and free volumes, respectively.
dc.description.sponsorship Authors gratefully acknowledge financial support of the Ministerio de Ciencia e Innovación (MAT2010-16815) y Ministerio de Economía y Competitividad (MAT2014-59116C2-1-R)
dc.language.iso eng
dc.publisher Royal Society of Chemistry
dc.rights © The Royal Society of Chemistry
dc.title Determination of the linear coefficient of thermal expansion in polymer films at the nanoscale: influence of the composition of EVA copolymers and the molecular weight of PMMA
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi https://doi.org/10.1039/c5cp02384j
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. MAT2010-16815
dc.relation.projectID Gobierno de España. MAT2014-59116C2-1-R
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 18495
dc.identifier.publicationissue 28
dc.identifier.publicationlastpage 18500
dc.identifier.publicationtitle Physcial Chemistry Chemical Physics
dc.identifier.publicationvolume 17
dc.identifier.uxxi AR/0000017144
dc.contributor.funder Ministerio de Ciencia e Innovación (España)
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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