چكيده به لاتين
The nanoparticles require surface modification due to high surface energy and lack of compatibility with continuous polymer phases. Silane coupling agents are including compounds that are used because of the possibility of connecting to the surface of the nanoparticles, to create a connection between nanoparticles and the continuous phase.
In this research, the surface modification of the cerium oxide (CeO2) nanoparticles, was examined to create compatibility with the rubber phase NBR (acrylonitrile butadiene rubber) to make the Hot Melt adhesive in the applications of anticorrosion coatings. The adhesive used in this research was a combination of NBR rubber and phenolic resin, which is usually used in various industries as adhesive.
In order to surface modification of the CeO2 nanoparticle and create compatibility with the rubber phase, a silane coupling agent was used with the scientific name of TESPT and the industrial name of Si69. Silane molecules were bounded through the Sol-Gel method on the surface of the CeO2 nanoparticle. The pH parameters, silane concentration, humidity effect, and humidity temperature are examined in silanization. On this basis, the surface hydroxyl and the hydroxyl ratio to silanes determined. The results showed that the nanoparticles with pre humidification had the most surface modification.
To identify the surface structure of particles Fourier-transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA) and Zeta Potential analysis were used. The curing properties of rubber and rubber based Hot Melt adhesive was investigated by ODR analysis (Oscillating Disc Rheometer). The results showed that the best curing properties belonged to the sample with pre humidification, which was matched with the result of the TGA analysis in the surface modification section. Peel and Lap Shear tests were used to check out the adhesion properties of adhesive, as well as cathodic disbondment and salt spray tests to check out the anti-corrosion properties of adhesive containing nanoparticles.
The samples of adhesive containing CeO2 nanoparticles with pre humidification were showed that these modified nanoparticles can be one of the reasons of reducing disbandment and maintain the adhesion, by releasing of cerium ions. Generally, results have shown that the raw CeO2 nanoparticles and the modified CeO2 nanoparticles without pre humidification causing disorder in the rubber curing. The modified CeO2 nanoparticles by TESPT and with pre humidification can increase the efficiency of the adhesive by creating a balance between curing properties as well as adhesion properties.
