Differentiation of silane adsorption onto model E-glass surfaces from mixed solutions of amino and glycidyl silanes

X.M. Liu, J.L. Thomason, F.R. Jones

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Mixed silanes are often used as coupling agents in sizings for glass fibres. A technique has been developed which enables the preferential adsorption of a particular silane onto a model E-glass from a mixed aqueous silane solution to be probed. It is shown that γ-Aminopropyltriethoxysilane (APS) is preferentially adsorbed over γ-glycidoxypropyltrimethoxysilane (GPS) onto model E-glass fibres. High resolution X-ray photoelectron spectroscopy (XPS) has been employed to investigate the nature of silane deposits. Differentiation between the hydrolysed silane deposit and the model silica-based glass substrate was achieved by Si2p curve fitting. The extent of total silane adsorption onto model E-glass fibres was determined from the intensity of CSiO3 peak. In the case of APS/GPS mixed silanes, the N1s peak intensity provides the concentration of APS in the deposit. By comparing the relative intensities of the components in the Si2p3/2 and Si2p1/2 peaks for SiO4 and CSiO3 with the intensity of the N1s peak an assessment of differential adsorption proved possible.
Original languageEnglish
Title of host publicationSilanes and Other Coupling Agents
EditorsKash L. Mittal
Number of pages12
Publication statusPublished - Apr 2007


  • adhesives
  • adhesion
  • coating processes
  • paints
  • weathering
  • tribology
  • silanes
  • E-glass fibres
  • model surfaces
  • coupling agents
  • X-ray photoelectron spectroscopy (XPS)

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