Surface functionalization of cyclic olefin copolymer with aryldiazonium salts: A covalent grafting method

•An effective method to modify cyclic olefin copolymer surface.•The surface of COC was modified by covalent grafting of aryl diazonium salts.•The wettability of COC surface was modulated by diazonium salts.•Photoinitiation and chemical reduction have to be combined to graft diazonium salt on COC sur...

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Bibliographic Details
Published in:Applied surface science 2015-02, Vol.329, p.337-346
Main Authors: Brisset, Florian, Vieillard, Julien, Berton, Benjamin, Morin-Grognet, Sandrine, Duclairoir-Poc, Cécile, Le Derf, Franck
Format: Article
Language:English
Subjects:
Analytical chemistry
Aromatic compounds
Biomolecules
Chemical Sciences
COC
Contact angle
Copolymers
Covalence
Cyclic olefin copolymer
Diazonium salt
Grafting
Interface
Olefins
Organic chemistry
Reduction (chemical)
Surface treatment
Topography
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Summary:•An effective method to modify cyclic olefin copolymer surface.•The surface of COC was modified by covalent grafting of aryl diazonium salts.•The wettability of COC surface was modulated by diazonium salts.•Photoinitiation and chemical reduction have to be combined to graft diazonium salt on COC surface. Covalent immobilization of biomolecules on the surface of cyclic olefin copolymer (COC) is still a tough challenge. We developed a robust method for COC surface grafting through reaction with aryldiazonium. Chemical diazonium reduction generated an aryl radical and the formation of a grafted film layer on the organic surface. We also demonstrated that the chemical reduction of diazonium salt was not sufficient to form a film on the COC surface. UV illumination had to be combined with chemical reduction to graft an aryl layer onto the COC surface. We optimized organic film deposition by using different chemical reducers, different reaction times and reagent proportions. We characterized surface modifications by fluorescence microscopy and contact angle measurements, infrared spectroscopy, X-ray photoemission spectroscopy and Raman spectroscopy, and assessed the topography of the aryl film by atomic force microscopy. This original strategy allowed us to evidence various organic functions to graft biomolecules onto COC surfaces with a fast and efficient technique.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.12.060