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dc.contributor.authorDillon, Brian
dc.contributor.authorDoran, Patrick
dc.contributor.authorFuenmayor, Evert
dc.contributor.authorHealy, Andrew V.
dc.contributor.authorGately, Noel M.
dc.contributor.authorMajor, Ian
dc.contributor.authorLyons, John G.
dc.date.accessioned2019-11-26T11:58:35Z
dc.date.available2019-11-26T11:58:35Z
dc.date.copyright2019
dc.date.issued2019-07-11
dc.identifier.citationDillon, B., Doran, P., Fuenmayor, E., Healy, A.V., Gately, N.M., Major, I., Lyons, J.G. (2019). Influence of annealing and biaxial expansion on the properties of poly-l-lactic) medical tubing. Polymers. 11(7): 1172. doi: 10.3390/polym11071172en_US
dc.identifier.issn2073-4360
dc.identifier.otherArticles - Materials Research Instituteen_US
dc.identifier.urihttp://research.thea.ie/handle/20.500.12065/2905
dc.description.abstractPoly-l-lactic acid (PLLA) is one of the most common bioabsorbable materials in the medical device field. However, its use in load-bearing applications is limited due to its inferior mechanical properties when compared to many of the competing metal-based permanent and bioabsorbable materials. The objective of this study was to directly compare the influence of both annealing and biaxial expansion processes to improve the material properties of PLLA. Results showed that both annealing and biaxial expansion led to an overall increase in crystallinity and that the crystallites formed during both processes were in the ’ and forms. 2D-WAXS patterns showed that the preferred orientation of crystallites formed during annealing was parallel to the circumferential direction. While biaxial expansion resulted in orientation in both axial and circumferential directions, with relatively equal sized crystals in both directions, Da (112 Å) and Dc (97 Å). The expansion process had the most profound e ect on mechanical performance, with a 65% increase in Young’s modulus, a 45% increase in maximum tensile stress and an 18-fold increase in strain at maximum load. These results indicate that biaxially expanding PLLA at a temperature above Tcc is possible, due to the high strain rates associated with stretch blow moulding.en_US
dc.formatPDFen_US
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.relation.ispartofPolymersen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/ie/*
dc.subjectBioabsorbable polymersen_US
dc.subjectPoly-l-lactic aciden_US
dc.subjectAnnealingen_US
dc.subjectBiaxial expansionen_US
dc.subjectOrientationen_US
dc.subjectCrystallinityen_US
dc.subjectStrain rateen_US
dc.titleInfluence of annealing and biaxial expansion on the properties of Poly-l-lactic) medical tubing.en_US
dc.typeArticleen_US
dc.description.peerreviewyesen_US
dc.identifier.doidoi: 10.3390/polym11071172
dc.identifier.orcidhttps://orcid.org/0000-0002-9466-5964
dc.identifier.orcidhttps://orcid.org/0000-0002-2610-2975
dc.identifier.orcidhttps://orcid.org/0000-0002-0538-9786
dc.identifier.orcidhttps://orcid.org/0000-0001-8982-7845
dc.identifier.orcidhttps://orcid.org/0000-0003-1998-070X
dc.rights.accessOpen Accessen_US
dc.subject.departmentMaterials Research Institute - AITen_US


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Attribution-NonCommercial-NoDerivs 3.0 Ireland
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland