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dc.contributor.authorSiegmann, Konstantin-
dc.contributor.authorInauen, Jan-
dc.contributor.authorVillamaina, Diego-
dc.contributor.authorWinkler, Martin-
dc.date.accessioned2018-08-14T14:47:04Z-
dc.date.available2018-08-14T14:47:04Z-
dc.date.issued2017-02-
dc.identifier.issn0169-4332de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/8964-
dc.description.abstractThe purpose of this study is to render polyethylene surfaces strongly and permanently hydrophobic. Polyethylene is a common plastic and, because of its inertness, difficult to graft. We chose polyethylene as example because of its ubiquity and model character. As graft chains linear perfluoroalkyl residues (−C4F9, −C6F13, −C8F17 and −C10F21) were chosen, and photografting was selected as grafting method. Photolytically generated nitrenes can insert into carbon–hydrogen bonds and are therefore suited for binding to polyethylene. Hydrophobic photo reactive surface modifiers based on azide/nitrene chemistry are designed, synthesized in high yield and characterized. Four new molecules are described. Water contact angles exceeding 110° were achieved on grafted polyethylene. One problem is to demonstrate that the photografted surface modifiers are bound covalently to the polyethylene. Abrasion tests show that all new molecules, when photografted to polyethylene, have a higher abrasion resistance than a polyethylene surface coated with a long-chain perfluoroalkane. Relative abrasion resitances of 1.4, 2.0, 2.1 and 2.5 compared to the fluoroalkane coating were obtained for the four compounds. An abrasion model using ice is developed. Although all four compounds have the same λmax of 266 nm in acetonitrile solution, their molar extincition coefficients increase from 1.6·104 to 2.2·104 with increasing length of the fluorotelomer chain. Exitonic coupling of the chromophores of the surface modifiers is observed for specific molecules in the neat state. A linear correlation of water contact angle with fluorine surface content, as measured by photoelectron spectroscopy, in grafted polyethylene surfaces is established.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofApplied Surface Sciencede_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectNitrenede_CH
dc.subjectAzidede_CH
dc.subjectInsertionde_CH
dc.subjectPolyethylenede_CH
dc.subjectPhotograftingde_CH
dc.subjectPerfluorinated compoundsde_CH
dc.subject.ddc660: Technische Chemiede_CH
dc.titlePhotografting of perfluoroalkanes onto polyethylene surfaces via azide/nitrene chemistryde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Materials and Process Engineering (IMPE)de_CH
dc.identifier.doi10.1016/j.apsusc.2016.11.007de_CH
zhaw.funding.euNode_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end680de_CH
zhaw.pages.start672de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume396de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedPolymere Beschichtungende_CH
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Siegmann, K., Inauen, J., Villamaina, D., & Winkler, M. (2017). Photografting of perfluoroalkanes onto polyethylene surfaces via azide/nitrene chemistry. Applied Surface Science, 396, 672–680. https://doi.org/10.1016/j.apsusc.2016.11.007
Siegmann, K. et al. (2017) ‘Photografting of perfluoroalkanes onto polyethylene surfaces via azide/nitrene chemistry’, Applied Surface Science, 396, pp. 672–680. Available at: https://doi.org/10.1016/j.apsusc.2016.11.007.
K. Siegmann, J. Inauen, D. Villamaina, and M. Winkler, “Photografting of perfluoroalkanes onto polyethylene surfaces via azide/nitrene chemistry,” Applied Surface Science, vol. 396, pp. 672–680, Feb. 2017, doi: 10.1016/j.apsusc.2016.11.007.
SIEGMANN, Konstantin, Jan INAUEN, Diego VILLAMAINA und Martin WINKLER, 2017. Photografting of perfluoroalkanes onto polyethylene surfaces via azide/nitrene chemistry. Applied Surface Science. Februar 2017. Bd. 396, S. 672–680. DOI 10.1016/j.apsusc.2016.11.007
Siegmann, Konstantin, Jan Inauen, Diego Villamaina, and Martin Winkler. 2017. “Photografting of Perfluoroalkanes onto Polyethylene Surfaces via Azide/Nitrene Chemistry.” Applied Surface Science 396 (February): 672–80. https://doi.org/10.1016/j.apsusc.2016.11.007.
Siegmann, Konstantin, et al. “Photografting of Perfluoroalkanes onto Polyethylene Surfaces via Azide/Nitrene Chemistry.” Applied Surface Science, vol. 396, Feb. 2017, pp. 672–80, https://doi.org/10.1016/j.apsusc.2016.11.007.


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