Abstract
To inhibit the agglomeration of nanotitanium dioxide, a poly (vinyl chloride) (PVC) composite film doped with folic acid-modified titanium dioxide was synthesized and characterized using X-ray powder diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. The average grain size of the folic acid-modified titanium dioxide was found to decrease by 1.3 nm, indicating that the cohesiveness of the nanoparticles is decreased. The lowest temperature for 1.0% thermal decomposition of PVC was determined to be 230.0 °C. The decomposition rate at the peak temperature is found to be 39.6% lower than that of a control sample. The stability of the PVC is improved due to a lower number of surface chlorine atoms as well intermolecular attraction. A mechanism for folic acid modification of titanium dioxide-doped PVC is proposed. After doping, the ester groups in the plasticizer show a significant decrease in the vibration peak intensities observed at 1264 cm−1, 1736 cm−1 and 1106 cm−1. The doped PVC film suppresses the release of CO2, and the strongest vibration peak at 1264 cm−1 is found to be 17.2% lower than that for the blank sample, indicating that doping is beneficial for plasticizer recovery.
Highlights
To inhibit the agglomeration of nanotitanium dioxide, a poly (PVC) composite film doped with folic acid-modified titanium dioxide was synthesized and characterized using X-ray powder diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy
Nanotitanium dioxide (NT) modified by Folic acid (FA) was synthesized using ultrasonic radiation, and doped PVC polymer films were prepared to reduce the agglomeration of nanoparticles, enhance the compatibility with PVC, and improve the thermal properties
The minimum temperature required for 1.0% thermal decomposition of the composite film with 1 phr FA/NT-doped PVC is 230.0 °C, which is much higher than the decomposition temperatures of 210.8 °C and 175.1 °C obtained for the control and blank samples, respectively
Summary
To inhibit the agglomeration of nanotitanium dioxide, a poly (vinyl chloride) (PVC) composite film doped with folic acid-modified titanium dioxide was synthesized and characterized using X-ray powder diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. PVC/TiO2 organic/inorganic nanocomposites are new materials that have attracted attention in recent decades These materials combine inorganic nanoparticles in a polymer matrix, and, in general, show greatly improved mechanical and optical p roperties[7–11]. It is a pure natural vitamin that is safe and nontoxic It contains multiple amino and carboxyl groups and shows weak acidity. The NT surface contains OH, which can combine with the carboxyl and amino groups on the FA macromolecular structure to produce an electrostatic attraction, remove hydroxyl groups from the NT surface, reduce hydrophilicity and improve hydrophobicity. In this way, the compatibility and affinity of FA/NT with PVC can be increased
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