Effect of Active Hydroxyl Groups on the Interfacial Bond Strength of Titanium with Segmented Polyurethane through .GAMMA.-mercapto Propyl Trimethoxysilane

Abstract

The objective of this study was to investigate the effect of active hydroxyl groups on a titanium (Ti) surface on the bond strength between Ti and segmented polyurethane (SPU) composite through γ-mercapto propyl trimethoxysilane (γ-MPS). Active hydroxyl groups on Ti surface oxide were controlled by immersion in hydrogen peroxide (H2O2) with different lengths of immersion time, and the resulting concentrations of active hydroxyl groups were evaluated using a zinc-complex substitution technique. For the H2O2-treated Ti, it was characterized using X-ray photoelectron spectroscopy and scanning electron spectroscopy. For the bond strength of Ti/γ-MPS/SPU interface, it was determined using a shear bond test. Results showed that the bond strength increased with increase in the concentration of active hydroxyl groups. In terms of durability after immersion in water at 310 K for 30 days, it was found that bond strength was improved with increase in active hydroxyl groups. Based on the results obtained, active hydroxyl groups on the surface oxide film were clearly one of the causes governing the interfacial bond strength.

Superhydrophobic surfaces based on self-organized TiO2-nanotubes

“…and condensation generally occur simultaneously. As described in literatures [39][40][41], covalent or hydrogen bonds will be develop between the hydroxyl groups of a metal surface and a coating. Auer et al [42] describe that the process of chemical bonding releases water.…”

Effects of a silane coupling agent on the tensile adhesive strength between resin and titanium

“…Therefore, it appears that the MPTS treatment/hydrolysis forms a thin film associated with the reaction of OH groups on the Ti surface and with an intermolecular reaction between neighboring MPTS moieties. Furthermore, silane coupling agents (hydrolyzed) have been utilized to mirror‐finished Ti for bonding with segmented poly(ureathane), and it has been confirmed that the reaction of OH groups on the metal surface with the silane compounds enhanced bond strength 13–15. The reaction of a silane coupling agent with a metal is probably involved the following series of reactions; the formation of a SiOH group by the hydrolysis of a SiOCH 3 group → the hydrogen bonding of the SiOH to a OH group on the metal surface →dehydration between the SiOH and the OH to form a SiOmetal bond → SiOSi bond formation by the reaction between neighboring SiOH groups 13…”

“…The essential use of an amine catalyst, which simultaneously accelerates the hydrolysis and self‐condensation of MPTS,19 suggests that MPTS is less reactive with metals than glass or silica. While OH groups on an oxide layer act as active sites for the reaction with hydrolyzed MPTS,11–15 there might be an insufficient quantity of OH groups on the metal surface for the reaction with MPTS. To solve this problem, sandblasting was applied; the sandblasting of non‐precious metals could effectively increase the surface area and the number of OH groups.…”

Biofunctionalization of Metals with Polymers

“…This technique is used for the creation of a new meta-based material having high strength, high toughness, and biofunction. UV irradiation to a Ti-SPU composite is clearly a factor governing the shear bond strength of the Ti/SPU interface [71]. In addition, active hydroxyl groups on the surface oxide film are clearly factors governing the shear bond strength [72].…”