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dc.contributor.authorOdent, Jérémy
dc.contributor.authorRaquez, Jean-Marie
dc.contributor.authorSamuel, Cédric
dc.contributor.authorBarrau, Sophie
dc.contributor.authorEnotiadis, Apostolos
dc.contributor.authorDubois, Philippe
dc.contributor.authorGiannelis, Emmanuel P.
dc.date.accessioned2018-01-04T07:51:42Z
dc.date.available2018-01-04T07:51:42Z
dc.date.issued2017-03-27
dc.identifier.citationOdent J, Raquez J-M, Samuel C, Barrau S, Enotiadis A, et al. (2017) Shape-Memory Behavior of Polylactide/Silica Ionic Hybrids. Macromolecules 50: 2896–2905. Available: http://dx.doi.org/10.1021/acs.macromol.7b00195.
dc.identifier.issn0024-9297
dc.identifier.issn1520-5835
dc.identifier.doi10.1021/acs.macromol.7b00195
dc.identifier.urihttp://hdl.handle.net/10754/626727
dc.description.abstractCommercial polylactide (PLA) was converted and endowed with shape-memory properties by synthesizing ionic hybrids based on blends of PLA with imidazolium-terminated PLA and poly[ε-caprolactone-co-d,l-lactide] (P[CL-co-LA]) and surface-modified silica nanoparticles. The electrostatic interactions assist with the silica nanoparticle dispersion in the polymer matrix. Since nanoparticle dispersion in polymers is a perennial challenge and has prevented nanocomposites from reaching their full potential in terms of performance we expect this new design will be exploited in other polymers systems to synthesize well-dispersed nanocomposites. Rheological measurements of the ionic hybrids are consistent with the formation of a network. The ionic hybrids are also much more deformable compared to the neat PLA. More importantly, they exhibit shape-memory behavior with fixity ratio Rf ≈ 100% and recovery ratio Rr = 79%, for the blend containing 25 wt % im-PLA and 25 wt % im-P[CL-co-LA] and 5 wt % of SiO2–SO3Na. Dielectric spectroscopy and dynamic mechanical analysis show a second, low-frequency relaxation attributed to strongly immobilized polymer chains on silica due to electrostatic interactions. Creep compliance tests further suggest that the ionic interactions prevent permanent slippage in the hybrids which is most likely responsible for the significant shape-memory behavior observed.
dc.description.sponsorshipJ.O. gratefully thanks Wallonie-Bruxelles International (WBI, mobility grant) and the Belgian American Educational Foundation (BAEF) for its financial support. J-M.R. is a research associate at F.R.S.-FNRS (Belgium). We gratefully acknowledge support from NPRP Grant No. 5-1437-1-243 from the Qatar National Research Fund. We also acknowledge use of facilities at the Cornell Center for Materials Research (CCMR) supported by the National Science Foundation under Award No. DMR-1120296 and the support of Award No. KUS-C1-018-02 made by the King Abdullah University of Science and Technology (KAUST). The authors also gratefully acknowledge the International Campus on Safety and Intermodality in Transportation (CISIT, France), the Nord-Pas-de-Calais Region (France), and the European Community (FEDER funds) for providing the funds for the dynamic mechanical analyzer.
dc.publisherAmerican Chemical Society (ACS)
dc.titleShape-Memory Behavior of Polylactide/Silica Ionic Hybrids
dc.typeArticle
dc.identifier.journalMacromolecules
dc.contributor.institutionDepartment of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, United States
dc.contributor.institutionLaboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), Place du Parc 23, 7000 Mons, Belgium
dc.contributor.institutionDepartment of Polymers and Composites Technology and Mechanical Engineering (TPCIM), Mines Douai, Rue Charles Bourseul 941, CS 10838, 59508 Douai, France
dc.contributor.institutionUnité Matériaux et Transformations (UMET)−CNRS UMR 8207, Université Lille 1, 59655 Villeneuve d’Ascq, France
kaust.grant.numberKUS-C1-018-02
dc.date.published-online2017-03-27
dc.date.published-print2017-04-11


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