Nitinol modified by in situ generated diazonium from its nitro precursor for the SI-ATRP of 2-hydroxyethyl methacrylate

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Résumé

The present work investigates the electrografting of in situ generated 2-bromoisobutyrate p-nitrophenyldiazonium salt (PD-Br) after the electroreduction of its nitro precursor (A-NO<inf>2</inf>Br) into amine on NiTi followed by the surface initiated atom transfer radical polymerization (SI-ATRP) of 2-hydroxyethyl methacrylate (HEMA). Nitinol is interesting for many biomedical applications. A great deal of attention has thus been paid to its surface modification in order to impart and/or improve its surface properties. This can be achieved using SI-ATRP which requires initiator i.e. PD-Br in this work. Results show the effective electrografting of PD-Br and the preservation of the TiO<inf>2</inf> surface layer (responsible for the biocompatibility of Nitinol) made possible by the gentle conditions used for the in situ generation. Nitinol corrosion resistance has been shown to be improved. This SI-ATRP initiator (PD-Br) leads to the successful polymerization of HEMA grafted at the surface of NiTi. Furthermore, the ATRP polymerization of HEMA has a double effect on the corrosion resistance of the modified NiTi. First, the conditions used contribute to a hydrothermal-like treatment which reinforces the TiO<inf>2</inf> layer of NiTi and so its biocompatibility but also its corrosion resistance. Second, the layer of PHEMA grafted further improves the corrosion resistance.

langue originaleAnglais
Pages (de - à)G94-F102
Nombre de pages9
journalJournal of Electrochemical Society
Volume162
Numéro de publication10
Les DOIs
étatPublié - 2015

Empreinte digitale

Atom transfer radical polymerization
polymerization
corrosion resistance
Corrosion resistance
atoms
biocompatibility
initiators
Biocompatibility
Polyhydroxyethyl Methacrylate
PHEMA
Polymerization
surface properties
Amines
Surface properties
Surface treatment
surface layers
amines
Salts
hydroxyethyl methacrylate
nitinol

Citer ceci

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title = "Nitinol modified by in situ generated diazonium from its nitro precursor for the SI-ATRP of 2-hydroxyethyl methacrylate",
abstract = "The present work investigates the electrografting of in situ generated 2-bromoisobutyrate p-nitrophenyldiazonium salt (PD-Br) after the electroreduction of its nitro precursor (A-NO2Br) into amine on NiTi followed by the surface initiated atom transfer radical polymerization (SI-ATRP) of 2-hydroxyethyl methacrylate (HEMA). Nitinol is interesting for many biomedical applications. A great deal of attention has thus been paid to its surface modification in order to impart and/or improve its surface properties. This can be achieved using SI-ATRP which requires initiator i.e. PD-Br in this work. Results show the effective electrografting of PD-Br and the preservation of the TiO2 surface layer (responsible for the biocompatibility of Nitinol) made possible by the gentle conditions used for the in situ generation. Nitinol corrosion resistance has been shown to be improved. This SI-ATRP initiator (PD-Br) leads to the successful polymerization of HEMA grafted at the surface of NiTi. Furthermore, the ATRP polymerization of HEMA has a double effect on the corrosion resistance of the modified NiTi. First, the conditions used contribute to a hydrothermal-like treatment which reinforces the TiO2 layer of NiTi and so its biocompatibility but also its corrosion resistance. Second, the layer of PHEMA grafted further improves the corrosion resistance.",
author = "Amory Jacques and Bastien Barth{\'e}l{\'e}my and Joseph Delhalle and Zineb Mekhalif",
year = "2015",
doi = "10.1149/2.0091511jes",
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journal = "Journal of the electrochemical society",
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TY - JOUR

T1 - Nitinol modified by in situ generated diazonium from its nitro precursor for the SI-ATRP of 2-hydroxyethyl methacrylate

AU - Jacques, Amory

AU - Barthélémy, Bastien

AU - Delhalle, Joseph

AU - Mekhalif, Zineb

PY - 2015

Y1 - 2015

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AB - The present work investigates the electrografting of in situ generated 2-bromoisobutyrate p-nitrophenyldiazonium salt (PD-Br) after the electroreduction of its nitro precursor (A-NO2Br) into amine on NiTi followed by the surface initiated atom transfer radical polymerization (SI-ATRP) of 2-hydroxyethyl methacrylate (HEMA). Nitinol is interesting for many biomedical applications. A great deal of attention has thus been paid to its surface modification in order to impart and/or improve its surface properties. This can be achieved using SI-ATRP which requires initiator i.e. PD-Br in this work. Results show the effective electrografting of PD-Br and the preservation of the TiO2 surface layer (responsible for the biocompatibility of Nitinol) made possible by the gentle conditions used for the in situ generation. Nitinol corrosion resistance has been shown to be improved. This SI-ATRP initiator (PD-Br) leads to the successful polymerization of HEMA grafted at the surface of NiTi. Furthermore, the ATRP polymerization of HEMA has a double effect on the corrosion resistance of the modified NiTi. First, the conditions used contribute to a hydrothermal-like treatment which reinforces the TiO2 layer of NiTi and so its biocompatibility but also its corrosion resistance. Second, the layer of PHEMA grafted further improves the corrosion resistance.

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