Effects of carbon‐coated titanium dioxide nanoparticles as a photostabilizer on the photodegradation of rigid poly(vinyl chloride)

Abstract

In this study, nanocomposites of rigid poly(vinyl chloride) (UPVC) using the synthesized carbon-coated titanium dioxide (TiO 2 ) nanoparticles and commercial powder of titanium dioxide (with rutile structure) were prepared by melt blending. The presence of carbon-coated TiO 2 nanoparticles with rutile structure in UPVC matrix led to an improvement in photo stability of UPVC nanocomposites in comparison with commercial UPVC. The photocatalytic degradation behavior of nanocomposites was investigated by measuring their structural changes, surface tension, and mechanical and morphological properties before and after UV exposure for 700 h. It was found that mechanical and physical properties of UPVC nanocomposites are not considerably reduced after UV exposure in the presence of carbon-coated TiO 2 nanoparticles even in small percentage of nanoparticles in comparison with the presence of commercial TiO 2 particles. Therefore, it can be concluded that UPVC/TiO 2 nanocomposite with low content of carboncoated TiO 2 nanoparticles(0.25 wt %) illustrated high stability under light exposure.

Photo-Stabilisation and UV Blocking Efficacy of Coated Macro and Nano-Rutile Titanium Dioxide Particles in Paints and Coatings

“…There are numerous recent publications investigating various ways in surface treating and impregnating nano-titania particles [33,34]. Carbon coating for photostabilising PVC is particularly relevant while many other areas coat the particles for environmental biological systems.…”

Effect of long time exposure on the chemical and physical properties of polyvinyl chloride/titanium dioxide nanocomposites

“…PVC (K-value 64-66; Bandar Imam Petrochemical Co., Tehran, Iran) as polymer matrix, two different TiO 2 , commercial rutile particles (Mapa-Trans Co., Kiev, Ukraine) and homemade rutile nanoparticles as UV absorber, 21 calcium carbonate (Poodrkar Co., Iran) as filler, chlorinated polyethylene (Poodrkar Co., Iran) as impact modifier, calcium stearate and zinc stearate (Poodrkar Co., Iran) as thermal stabilizers, paraffin wax (Poodrkar Co., Iran) as internal lubricant, and stearic acid (EPS IMPEX Co., Kota Kinabalu, Malaysia) as external lubricant were used to prepare PVC/TiO 2 nanocomposite compounds.…”

“…[6][7][8][9][10][11] The white pigment titanium dioxide (TiO 2 ) is a particularly effective UV absorber because of the specific effects on absorbing UV irradiation, and its influence on the weatherability of different polymer composites (CPs) has been widely studied. [12][13][14][15][16][17][18][19][20][21] Allen et al 12 studied the influence of coated and uncoated anatase and rutile TiO 2 on the thermal and photochemical oxidation of low density polyethylene (LDPE) by Fourier transform infrared (FTIR) spectroscopy and hydroperoxide analysis. Ma et al 13 investigated the effect of nano TiO 2 on the crystalline structure of LDPE.…”

“…Based on our previous work, 20,21 the photostability behavior of PVC nanocomposites containing different amounts of homemade TiO 2 nanostructure materials (nanoparticles and nanorods) as UV absorber was investigated for short periods of exposure. But in this work, to investigate the influence of photo exposure on the structure and chemical properties of the prepared nanocomposites quantitatively and monitoring the effect of wavelength and intensity in a fairly long period of time, the extent of formation of main products of PVC/TiO 2 nanocomposites photodegradation was studied.…”