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dc.contributor.authorLu, Y.*
dc.contributor.authorThompson, Glen P.*
dc.contributor.authorLyu, D.*
dc.contributor.authorCaton-Rose, Philip D.*
dc.contributor.authorCoates, Philip D.*
dc.contributor.authorMen, Y.*
dc.date.accessioned2019-05-01T13:32:14Z
dc.date.available2019-05-01T13:32:14Z
dc.date.issued2018
dc.identifier.citationLu Y, Thompson GP, Lyu D et al (2018) Orientation direction dependency of cavitation in pre-oriented isotactic polypropylene at large strains. Soft Matter. 14(22): 4432-4444.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17002
dc.descriptionYesen_US
dc.description.abstractOrientation direction dependency of whitening activated at large strains was studied using four pre-oriented isotactic polypropylene (iPP) samples with different molecular weights stretched along different directions with respect to the pre-orientation (0°, 45°, and 90°) by means of in situ wide-, small-, and ultra-small-angle X-ray scattering techniques. A macroscopic fracture of iPP materials was also observed following the stress whitening at large strains. These two associated processes in pre-oriented iPP samples at elevated temperatures were found to be governed by not only the molecular weight of iPP but also the pre-orientation direction. For a certain pre-orientation direction of iPP, both the critical stress of cavitation induced-whitening and failure stress increased with increasing molecular weight. For one given molecular weight, the pre-oriented iPP showed the smallest critical stress for whitening and failure stress along the pre-orientation direction (0°) while the samples displayed larger values for the same behaviors when stretched at 45° or 90° with respect to the pre-orientation direction. Such behavior suggested that oriented amorphous networks, with different mechanical strengths, can be generated during the second deformation processes in these pre-oriented iPP samples. The evolution of inter-fibrillar tie chains in highly oriented amorphous networks was considered as the main factor controlling the response of the inner network to the external stress since the cavitation-induced whitening activated at large strains was caused by the failure of load bearing inter-fibrillar tie chains in the oriented amorphous network.en_US
dc.language.isoenen_US
dc.rights(c) 2018 RSC. Full-text reproduced in accordance with the publisher's self-archiving policy.en_US
dc.subjectOrientationen_US
dc.subjectIsotactic polypropyleneen_US
dc.subjectiPPen_US
dc.titleOrientation direction dependency of cavitation in pre-oriented isotactic polypropylene at large strainsen_US
dc.status.refereedYesen_US
dc.date.Accepted2018-03-20
dc.date.application2018-03-20
dc.typeArticleen_US
dc.type.versionAccepted manuscripten_US
dc.identifier.doihttps://doi.org/10.1039/C7SM02446K
refterms.dateFOA2019-05-01T13:32:14Z


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