Hydrolytic Stability of 3-Aminopropylsilane Coupling Agent on Silica and Silicate Surfaces at Elevated Temperatures

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Hydrolytic Stability of 3-Aminopropylsilane Coupling Agent on Silica and Silicate Surfaces at Elevated Temperatures

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Publication Article, peer reviewed scientific
Title Hydrolytic Stability of 3-Aminopropylsilane Coupling Agent on Silica and Silicate Surfaces at Elevated Temperatures
Author Okhrimenko, Denis V. ; Budi, Akin ; Ceccato, Marcel ; Cárdenas, Marité ; Johansson, Dorte B. ; Lybye, Dorthe ; Bechgaard, Klaus ; Andersson, Martin P. ; Stipp, Susan L. S.
Research Centre Biofilms - Research Center for Biointerfaces
Date 2017
English abstract
3-Aminopropylsilane (APS) coupling agent is widely used in industrial, biomaterial, and medical applications to improve adhesion of polymers to inorganic materials. However, during exposure to elevated humidity and temperature, the deposited APS layers can decompose, leading to reduction in coupling efficiency, thus decreasing the product quality and the mechanical strength of the polymer–inorganic material interface. Therefore, a better understanding of the chemical state and stability of APS on inorganic surfaces is needed. In this work, we investigated APS adhesion on silica wafers and compared its properties with those on complex silicate surfaces such as those used by industry (mineral fibers and fiber melt wafers). The APS was deposited from aqueous and organic (toluene) solutions and studied with surface sensitive techniques, including X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), streaming potential, contact angle, and spectroscopic ellipsometry. APS configuration on a model silica surface at a range of coverages was simulated using density functional theory (DFT). We also studied the stability of adsorbed APS during aging at high humidity and elevated temperature. Our results demonstrated that APS layer formation depends on the choice of solvent and substrate used for deposition. On silica surfaces in toluene, APS formed unstable multilayers, while from aqueous solutions, thinner and more stable APS layers were produced. The chemical composition and substrate roughness influence the amount of deposited APS. More APS was deposited and its layers were more stable on fiber melt than on silica wafers. The changes in the amount of adsorbed APS can be successfully monitored by streaming potential. These results will aid in improving industrial- and laboratory-scale APS deposition methods and increasing adhesion and stability, thus increasing the quality and effectiveness of materials where APS is used as a coupling agent.
DOI https://doi.org/10.1021/acsami.6b14343 (link to publisher's fulltext.)
Publisher American Chemical Society
Host/Issue ACS Applied Materials & Interfaces;9
Volume 9
ISSN 1944-8244
Language eng (iso)
Subject adhesion
aminosilane
coatings
fibers
material stability
mineral wool
surface treatment
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/24201 Permalink to this page
Link to publication in DiVA Find this research publication in DiVA (n/a for student publ.)
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