Hydrolysis and grafting of dimethylalkoxysilanes onto stainless steel

被引:3
作者
Huser, Julien [1 ]
Bistac, Sophie [1 ]
Delaite, Christelle [1 ]
Dentel, Didier [2 ]
Derivaz, Mickael [2 ]
Zanouni, Mohamed [2 ,3 ]
机构
[1] Univ Haute Alsace, Equipe Chim & Physicochim Polymeres, Lab Photochim & Ingn Macromol, F-68093 Mulhouse, France
[2] Univ Haute Alsace, Inst Sci Mat Mulhouse IS2M, UMR CNRS UHA 7361, F-68093 Mulhouse, France
[3] Univ Abdelmalek Essaadi, Equipe Rech Mecan Mat & Met, FST, Tangier 90050, Morocco
关键词
alkoxysilane; stainless steel; adhesion; H-1; NMR; XPS; SILANE COUPLING AGENTS; ADSORPTION CHARACTERISTICS; CONDENSATION-REACTIONS; NMR-SPECTROSCOPY; SILICA SURFACES; KINETICS; WATER; IRON; (3-AMINOPROPYL)DIMETHYLETHOXYSILANE; ALKOXYSILANES;
D O I
10.1002/sia.5742
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The grafting of trialkoxysilane molecules should also give rise to the formation of a siloxane network at the substrate's surface when trialkoxysilanes are used. Other candidates that might be able to act as adhesion promoters at metallic surfaces are dimethylalkoxysilanes. The advantage of dimethylalkoxysilanes is that only one silanol group is produced during the hydrolysis step, leading to the formation of a grafted monolayer onto the steel. Moreover, the chemical grafting of stainless steel, which exhibits a low surface reactivity, is of great interest for industrial applications such as adhesive bonding or coatings. The objective of this work was to chemically graft dimethylalkoxysilanes onto AISI 316L stainless steel and to analyze the grafted layer by X-ray photoelectron spectroscopy (XPS). Investigation of the hydrolysis of these molecules in aqueous solutions was also performed by proton nuclear magnetic resonance spectroscopy (H-1 NMR). The grafting of 3-(ethoxydimethylsilyl)propylamine (APDES) and 3-glycidoxypropyldimethylethoxysilane (GPDES) was achieved onto stainless steel after a controlled hydrolysis reaction. A pH inferior or equal to 5 was necessary to obtain a sufficient hydrolysis of silanes. XPS results have evidenced the grafting of the silanes onto stainless steel. The signal of the Si 2p peak clearly showed the formation of a covalent bond between APDES and the stainless steel surface through the O atoms giving rise to a uniform layer of adsorbed molecules. Moreover, this grafted layer is strongly stable as no removal of the alkoxysilane was observed after immersion in hot water which is very critical for these molecules. Copyright (c) 2015 John Wiley & Sons, Ltd.
引用
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页码:523 / 528
页数:6
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