Direct measurements of the temperature, depth and processing dependence of phenyl ring dynamics in polystyrene thin films by β-detected NMR

Simple item page
dc.contributor.authorMcKenzie, Ien_AU
dc.contributor.authorChai, Yen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorForrest, JAen_AU
dc.contributor.authorFujimoto, Den_AU
dc.contributor.authorKarner, VLen_AU
dc.contributor.authorKiefl, RFen_AU
dc.contributor.authorLevy, CDPen_AU
dc.contributor.authorMacFarlane, WAen_AU
dc.contributor.authorMcFadden, RMLen_AU
dc.contributor.authorMorris, GDen_AU
dc.contributor.authorPearson, MRen_AU
dc.contributor.authorZhu, Sen_AU
dc.date.accessioned2024-12-05T22:34:33Zen_AU
dc.date.available2024-12-05T22:34:33Zen_AU
dc.date.issued2018-05-24en_AU
dc.date.statistics2024-04-02en_AU
dc.description.abstractThere is indirect evidence that the dynamics of a polymer near a free surface are enhanced compared with the bulk but there are few studies of how dynamics varies with depth. β-Detected nuclear spin relaxation of implanted 8Li+ has been used to directly probe the temperature and depth dependence of the γ-relaxation mode, which is due to phenyl rings undergoing restricted rotation, in thin films of atactic deuterated polystyrene (PS-d8) and determine how the depth dependence of dynamics is affected by sample processing, such as annealing, floating on water and the inclusion of a surfactant, and by the presence of a buried interface. The activation energy for the γ-relaxation process is lower near the free surface. Annealing the PS-d8 films and then immersing in water to mimic the floating procedure used to transfer films had negligible effects on the thickness of the region near the free surface with enhanced mobility. Measurements on a bilayer film indicate enhanced phenyl ring dynamics near the buried interface compared with a single film at the same depth. PS-d8 films annealed with the surfactant sodium dodecyl sulfate (SDS) deposited on the surface show enhanced dynamics in the bulk compared with a pure PS-d8 film and a PS-d8 film where the SDS was washed away. There is less contrast between the surface and bulk in the SDS-treated sample, which could account for the elimination of the Tg confinement effect observed in films containing SDS [Chen and Torkelson, Polymer, 2016, 87, 226]. © The Royal Society of Chemistry 2018.en_AU
dc.description.sponsorshipThe β-NMR experiments were performed at the TRIUMF Centre for Materials and Molecular Science under experiments M1354 and M1530. The work was supported financially by TRIUMF, which is operated by a consortium of Canadian universities under a contribution from the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the Canadian Institute for Advanced Research (CIfAR) and the Perimeter Institute for Theoretical Physics. Research at Perimeter Institute is supported by the Government of Canada through Industry Canada and by the Province of Ontario through the Ministry of Economic Development and Innovation. The authors thank R. Abasalti and D. Vyas for technical assistance, C. R. Daley for assistance with sample preparation, I. Kuprov, P. W. Percival and J. Ripmeester for useful discussions, M. Harada for the PEO:LiTFSI sample and M. Stachura for assistance with the beam time. RMLM acknowledges the support of an NSERC CREATE IsoSim fellowship.en_AU
dc.format.mediumPrinten_AU
dc.identifier.citationMcKenzie, I., Chai, Y., Cortie, D. L., Forrest, J. A., Fujimoto, D., Karner, V. L., Kiefl, R. F., Levy, C. D. P., MacFarlane, W. A., McFadden, R. M. L., Morris, G. D., Pearson, M. R., & Zhu, S. (2018). Direct measurements of the temperature, depth and processing dependence of phenyl ring dynamics in polystyrene thin films by β-detected NMR. Soft Matter, 14(36), 7324-7334. doi:10.1039/C8SM00812Den_AU
dc.identifier.issn1744-683Xen_AU
dc.identifier.issn1744-6848en_AU
dc.identifier.issue36en_AU
dc.identifier.journaltitleSoft Matteren_AU
dc.identifier.pagination7324-7334en_AU
dc.identifier.urihttps://doi.org/10.1039/c8sm00812den_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15789en_AU
dc.identifier.volume14en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectThin Filmsen_AU
dc.subjectPolystyreneen_AU
dc.subjectTemperature measurementen_AU
dc.subjectDepthen_AU
dc.subjectSodiumen_AU
dc.subjectSpinen_AU
dc.subjectPolymersen_AU
dc.titleDirect measurements of the temperature, depth and processing dependence of phenyl ring dynamics in polystyrene thin films by β-detected NMRen_AU
dc.typeJournal Articleen_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.66 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles