Influence of adsorption characteristics of silane on the hydrolytic stability of silane at the silica-matrix interface

• Published in: Composites 1995, Vol.26 (4), p.309-313
• Main Authors: Nishiyama, Norihiro, Komatsu, Koichi, Fukai, Kyouko, Nemoto, Kimiya, Kumagai, Masashi
• Format: Article
• Language: English
• Subjects: adsorption characteristics; Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; hydrolytic stability; Polymer industry, paints, wood; silane; silane multilayer; silica-matrix interface; Technology of polymers
• ISSN: 0010-4361; 1878-7134
• DOI: 10.1016/0010-4361(95)93674-9

To gain insight into which parameters control the hydrolytic stability of the silane multilayer at the silica-matrix interface, the effects of addition of hydrochloric acid to silane solution on the characteristics of silane adsorbed on to a colloidal silica surface were investigated using g.p.c. and CP/MAS 29Si n.m.r. The characteristics of the silane chemisorbed on the silica surface in the non-acidic conditions are different from those under acidic conditions. This is due to the fact that the silane molecular species chemisorbed on the silica surface differs when in non-acidic and acidic conditions: the monomer and dimer species are mainly chemisorbed on to the surface in non-acidic conditions; whereas, under acidic conditions, a tretramer of higher molecular weight is chemisorbed on the silica surface. In addition to the above investigations, the effects of the adsorption characteristics of silane on the hydrolytic stability of silane at the silica-matrix interface were studied by means of a tensile test. The hydrolytic stability of the silane is dependent upon the cohesion strength of the silane multilayer, particularly that between the chemisorbed and the physisorbed silane. The increased hydrolytic stability is afforded by means of species which have an increased potential for hydrogen bonding.