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dc.contributor.authorLi, J.*
dc.contributor.authorZhao, X.*
dc.contributor.authorYe, L.*
dc.contributor.authorCoates, Philip D.*
dc.contributor.authorCaton-Rose, Philip D.*
dc.date.accessioned2019-05-02T09:30:36Z
dc.date.available2019-05-02T09:30:36Z
dc.date.issued2019-04
dc.identifier.citationLi J, Zhao X, Ye L et al (2019) Multiple shape memory behavior of highly oriented long‐chain‐branched poly(lactic acid) and its recovery mechanism. Journal of Biomedical Materials Research - Part A. 107(4): 872-883.en_US
dc.identifier.urihttp://hdl.handle.net/10454/17008
dc.descriptionYesen_US
dc.description.abstractThe shape memory effect of highly oriented long‐chain‐branched poly(lactic acid) (LCB‐PLA) prepared through solid‐phase die drawing technology was studied by comparison with PLA. When the recovery temperature increased from 60°C to 120°C, for PLA, only one‐step recovery at about 80°C can be observed and the recovery ratio was below 21.5%, while, for LCB‐PLA, multiple recovery behavior with high recovery ratio of 78.8% can be achieved. For oriented PLA, the recovery curve of the final sample showed the same trend with that of sample suffering just free drawing; while for oriented LCB‐PLA, the recovery curve of the final sample showed the same trend with that of sample suffering just die drawing. After shape recovery, the mechanical properties of LCB‐PLA showed a linear downward trend with the recovery temperature. Together with amorphous phase, the oriented mesomorphic phase, which formed during solid die drawing, can act as switching domains. And thus, upon heating, the chain segment of amorphous phase relaxed at first and triggered the first macroscopical shape recovery, leading to the decrease of long period (Lac) and the thickness of the amorphous layer (La). Then, with further increasing temperature, the oriented mesomorphic phase gradually relaxed resulting subsequently multi‐shape recovery, and the Lac and the La further decreased. Therefore, by regulating the recovery temperature of oriented LCB‐PLA, the shape recovery ratio and mechanical strength can be controlled effectively, and thus the self‐reinforced and self‐fastening effect can be achieved simultaneously for PLA as bone fixation material.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://doi.org/10.1002/jbm.a.36604en_US
dc.rights© 2019 Wiley. This is the peer-reviewed version of the following article: Li J, Zhao X, Ye L et al (2019) Multiple shape memory behavior of highly oriented long‐chain‐branched poly(lactic acid) and its recovery mechanism. Journal of Biomedical Materials Research - Part A. 107(4): 872-883, which has been published in final form at https://doi.org/10.1002/jbm.a.36604. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en_US
dc.subjectLong-chain-branched poly(lactic acid)en_US
dc.subjectLCB-PLAen_US
dc.subjectSolid-phase die drawingen_US
dc.subjectMultiple shape memory behaviouren_US
dc.subjectRecovery mechanismen_US
dc.titleMultiple shape memory behavior of highly oriented long‐chain‐branched poly(lactic acid) and its recovery mechanismen_US
dc.status.refereedYesen_US
dc.date.Accepted2018
dc.date.application2019-01-07
dc.typeArticleen_US
dc.type.versionAccepted manuscripten_US


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