Abstract
Practical adhesion of rubber to aluminum is measured for various aluminum silanization treatments. In this study, 6-(3-triethoxysilylpropylamino)-1,3,5-triazine-2,4- dithiol (TES) was used as the coupling agent for preparing self-assembly monolayers (SAMs) on an aluminum surface. The structure and chemical composition of the SAMs were analyzed using Fourier transform infra-red spectroscopy (FT-IR) and X-ray photo-electron spectroscopy (XPS). The changes in the surface features of the aluminum surface due to TES treatment were investigated by atomic force microscopy (AFM). The adhesive properties of the silanized aluminum surface and EPDM rubber have been evaluated by a T-peel strength test. The results suggested that the Si-O-Al bonding at aluminum TES interface existed and a TES self-assembly monolayer was formed on the aluminum surface. More than 6.0 KN/m adhesion strength is obtained when the aluminum is silanized with 2.5 mmol/dm3 TES, cured at 160 °C and vulcanized with EPDM rubber at 160 °C for 30 min. It is suggested that the TES self-assembly monolayer is bound to aluminum through its ethoxysilyl functional group, and the thiol function group is strongly cross-linked to EPDM rubber, respectively.
Highlights
Aluminum alloys are widely used in numerous industrial applications, due to their low cost, light weight, and high mechanical strength
It is suggested that the TES self-assembly monolayer is bound to aluminum through its ethoxysilyl functional group, and the thiol function group is strongly crosslinked to EPDM rubber, respectively
The adhesion strength of TES self-assembly monolayer coated aluminum substrate to EPDM rubber was investigated by T-peel test using an autograph S-100 apparatus (Shimadsu Corporation)
Summary
Aluminum alloys are widely used in numerous industrial applications, due to their low cost, light weight, and high mechanical strength. Silane coupling agents [15,16], which have already been widely used in several surface applications, such as adhesion promoters for metals, polymeric and inorganic materials [17,18,19], appear to be good candidates This new method requires that the organic alkoxysilane interact with rubber and the metallic surface. The group X is selected in order to interact with another group Y grafted to the natural rubber (NR–Y), and outstanding adhesion should be expected from the formation of covalent bonds (M–O–Si–R–X–Y–NR) between the two substrates First experiments following this technology were described by Thiedman et al . The changes in the surface morphology of the aluminum substrate, structure and chemical composition of SAM were evaluated by atomic force microscope (AFM), contact angle, Fourier transform infra-red spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS)
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