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dc.contributor.authorVan Loock, Frederiken
dc.contributor.authorBernardo, Victoriaen
dc.contributor.authorRodríguez Pérez, Miguel Angelen
dc.contributor.authorFleck, Normanen
dc.date.accessioned2019-09-18T23:31:07Z
dc.date.available2019-09-18T23:31:07Z
dc.date.issued2019-10-02en
dc.identifier.issn1364-5021
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/296965
dc.description.abstractSolid-state nanofoaming experiments are conducted on two PMMA grades of markedly different molecular weight using CO₂ as the blowing agent. The sensitivity of porosity to foaming time and foaming temperature is measured. Also, the microstructure of the PMMA nanofoams is characterized in terms of cell size and cell nucleation density. A onedimensional numerical model is developed to predict the growth of spherical, gas-filled voids during the solid-state foaming process. Diffusion of CO₂ within the PMMA matrix is sufficiently rapid for the concentration of CO₂ to remain almost uniform spatially. The foaming model makes use of experimentally calibrated constitutive laws for the uniaxial stress versus strain response of the PMMA grades as a function of strain rate and temperature, and the effect of dissolved CO₂ is accounted for by a shift in the glass transition temperature of the PMMA. The maximum achievable porosity is interpreted in terms of cell wall tearing and comparisons are made between the predictions of the model and nanofoaming measurements; it is deduced that the failure strain of the cell walls is sensitive to cell wall thickness.
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.publisherThe Royal Society
dc.rightsAll rights reserved
dc.rights.uri
dc.titleThe mechanics of solid-state nanofoaming.en
dc.typeArticle
prism.issueIdentifier2230en
prism.publicationDate2019en
prism.publicationNameProceedings. Mathematical, physical, and engineering sciencesen
prism.startingPage20190339
prism.volume475en
dc.identifier.doi10.17863/CAM.44006
dcterms.dateAccepted2019-08-27en
rioxxterms.versionofrecord10.1098/rspa.2019.0339en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-10-02en
dc.contributor.orcidVan Loock, Frederik [0000-0003-0581-2238]
dc.contributor.orcidBernardo, Victoria [0000-0002-1985-1214]
dc.contributor.orcidFleck, Norman [0000-0003-0224-1804]
dc.identifier.eissn1471-2946
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (1611305)
cam.orpheus.successThu Jan 30 10:38:22 GMT 2020 - Embargo updated*
rioxxterms.freetoread.startdate2019-10-02


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