Surface Functionalization with Phosphazenes: Part 6. Modification of Polyethylene-Co-Polyvinylalcohol Copolymer Surface Plates with Fluorinated Alcohols and Azobenzene Derivatives Using Chlorinated Phosphazenes as Coupling Agents |
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Authors: | Roberto Milani Mario Gleria Silvia Gross Roger De Jaeger Ahmed Mazzah Leon Gengembre Martine Frere Charafeddine Jama |
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Affiliation: | 1. Dipartimento di Scienze Chimiche, Università di Padova, via F.Marzolo 1, 35131, Padova, Italy 2. Istituto di Scienze e Tecnologie Molecolari (ISTM) del Consiglio Nazionale delle Ricerche, Sezione di Padova, c/o Dipartimento di Processi Chimici dell’Ingegneria, Università di Padova, via F.Marzolo 9, 35131, Padova, Italy 3. LASIR UMR-CNRS 8516, USTL, 59655, Villeneuve d’Ascq, France 4. Unité de Catalyse et Chimie du Solide UCCS CNRS UMR 8181, USTL, 59655, Villeneuve d’Ascq, France 5. Laboratoire PERF LSPES UMR 8008, ENSCL, BP 90108, 59652, Villeneuve d’Ascq, France
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Abstract: | In this paper we describe a two-step surface modification process of poly(ethylene-co-vinyl alcohol) by exploiting hexachlorocyclophosphazene and poly(dichlorophosphazene) as coupling agents. Part of the P–Cl
groups of the chlorophosphazenes is first reacted with the surface hydroxylic groups of the substrate to form covalent P–O–C
bonds, the remaining being utilized for successive substitution reactions with different nucleophiles (i.e. 2,2,2-trifluoroethanol,
heptadecafluorononanol and 4-hydroxyazobenzene). Modified surface properties, such as hydrophobicity improvement with fluorinated
alcohols and photochromic features with the azobenzene derivative, were verified by contact angle measurements and UV–Vis
spectroscopy, respectively, while changes in surface composition were demonstrated through XPS spectroscopy. |
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Keywords: | Surface functionalization Poly(ethylene-co-vinyl alcohol) Phosphazene Fluorinated alcohols 4-Hydroxyazobenzene UV– Vis and XPS spectroscopy |
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