dc.creatorBuffa, Fabián Alejandro
dc.creatorAbraham, Gustavo Abel
dc.creatorBrian P. Grady
dc.creatorDaniel E. Resasco
dc.date.accessioned2019-02-22T20:05:50Z
dc.date.accessioned2022-10-15T04:42:52Z
dc.date.available2019-02-22T20:05:50Z
dc.date.available2022-10-15T04:42:52Z
dc.date.created2019-02-22T20:05:50Z
dc.date.issued2007-12
dc.identifierBuffa, Fabián Alejandro; Abraham, Gustavo Abel; Brian P. Grady; Daniel E. Resasco; Effect of Nanotube Functionalization on the Properties of Single-Walled Carbon Nanotube/Polyurethane Composites; John Wiley & Sons Inc; Journal of Polymer Science Part B: Polymer Physics; 45; 4; 12-2007; 490-501
dc.identifier0887-6266
dc.identifierhttp://hdl.handle.net/11336/70742
dc.identifierCONICET Digital
dc.identifierCONICET
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4346164
dc.description.abstractA commercially available aliphatic thermoplastic polyurethane formulated with a methylene bis(cyclohexyl) diisocyanate hard segment and a poly(tetramethylene oxide) soft segment and chain-extended with 1,4-butanediol was dissolved in dimethylformamide and mixed with dispersed single-walled carbon nanotubes. The properties of composites made with unfunctionalized nanotubes were compared with the properties of composites made with nanotubes functionalized to contain hydroxyl groups. Functionalization almost eliminated the conductivity of the tubes according to the conductivity of the composites above the percolation threshold. In most cases, functionalized and unfunctionalized tubes yielded composites with statistically identical mechanical properties. However, composites made with functionalized tubes did have a slightly higher modulus in the rubbery plateau region at higher nanotube fractions. Small-angle X-ray scattering patterns indicated that the dispersion reached a plateau in the unfunctionalized composites that was consistent with the plateau in the rubbery plateau region. The room-temperature modulus and tensile strength increase was proportionally higher than almost all increases seen previously in thermoplastic polyurethanes; however, the increase was still an order of magnitude below what has been reported for the best nanotube-polymer systems. Nanotube addition increased the hard-segment glass transition temperature slightly, whereas the soft-segment glass transition was so diffuse that no conclusions could be drawn. Unfunctionalized tubes suppressed the crystallization of the hard segment; whereas functionalized tubes had no effect. © 2007 Wiley Periodicals, Inc.
dc.languageeng
dc.publisherJohn Wiley & Sons Inc
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1002/polb.21069
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/polb.21069
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectCRYSTALLIZATION
dc.subjectGLASS TRANSITION
dc.subjectNANOCOMPOSITES
dc.subjectPOLYURETHANES
dc.subjectSAXS
dc.subjectSEGMENTED POLYURETHANES
dc.subjectSINGLE-WALLED CARBON NANOTUBES
dc.titleEffect of Nanotube Functionalization on the Properties of Single-Walled Carbon Nanotube/Polyurethane Composites
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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