Effect of surface modification of titanium dioxide on the UV‐C aging behavior of silicone rubber

Abstract

Surface modification of titanium dioxide (TiO 2 ) nanoparticles (NPs) by silane coupling agents and the ultraviolet-C (UV-C) aging behavior of silicone rubber (SiR) incorporated with the modified TiO 2 NPs were investigated in this work. The SiR samples incorporated with TiO 2 NPs displayed excellent stability against the UV-C radiation. In order to improve the dispersion of TiO 2 NPs in the SiR matrix, the surface of TiO 2 NPs was modified with 3-aminopropyl triethoxysilane and 3-trimethoxysilyl propyl methacrylate, respectively. The surface modification of TiO 2 NPs was characterized by thermal gravimetric analysis and Fourier transform infrared spectroscopy. The dispersion stability of the pristine TiO 2 NPs and surface silane-modified TiO 2 NPs was evaluated in an organic solvent (toluene). Effect of surface modified TiO 2 NPs on the UV-C aging behavior of SiR was evaluated in terms of the change of surface morphology, tensile properties, hardness, crosslinking density, and surface microstructure before and after the UV-C aging. The results showed that surface modification of TiO 2 NPs with silane coupling agents could improve the dispersion of TiO 2 NPs in the SiR matrix. Moreover, the SiR with modified TiO 2 NPs showed an improved aging resistance to the UV-C radiation, compared with the samples with pristine TiO 2 NPs.

Superhydrophobic and low-hysteresis coating based on rubber-modified TiO2/SiO2 nanoparticles

“…As shown in this figure, the relative intensity of C-H to the Si-O peak increases by UV irradiation, which can be due to photo-oxidation of the SR matrix in the presence of TiO 2 NPs. This process can increase the surface roughness by improving particle dispersion in the SR matrix, which is in agreement with the previously reported results [36]. In addition, three effects are observed in the annealed spectrum, in figure 4: broad water peaks at 3270 and 1630 cm -1 decrease due to the evaporation of water, the Si-OH peak decreases relative to Si-O-Si peaks showing that heat condenses the silica NPs, and some of the C-H peaks may have been lost due to oxidation.…”

Effect of silica‐coated TiO2 nanorods on the foamability of polypropylene and photostability of foamed polypropylene

“…When exposed to sunlight, UV absorption of rutile TiO 2 will cause the excitation and transfer of electrons in TiO 2 , and the electron–hole pairs with redox ability generated have a catalytic decomposition effect on the organics around them. Hence, great efforts have been made to suppress the photocatalytic activity of TiO 2 nanoparticle without destroying its UV shielding performance, mainly involving surface modified with coupling agents 26 or coated with inorganic minerals 27,28 . In the previous work of our group, well‐defined rutile TiO 2 nanorods were synthesized 25 .…”

Effect of Ageing on the Tracking Characteristics of High-Temperature Vulcanized Silicone Rubber Hybrid Composites for High Voltage Insulation

“…They concluded that the addition of nano and micro fillers improve the tracking and erosion resistance [29]. Zhang, H. et al fabricated SiR nanocomposites using surface-modified TiO 2 nanoparticles and studied the UV ageing behavior [30]. Rashid, A. et al fabricated SiR/silica hybrid composites using SiO 2 nanoparticles and microparticles.…”

“…They investigated the environmental effects using the accelerated ageing test in a multi stress environmental chamber and, found that the hybrid composites offer high resistance against degradation due to ageing [31,32]. Techniques like scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), thermal gravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) were used by the researchers to understand the material degradation characteristics due to ageing [28][29][30][31][32].…”