A novel route for preparation of PVC sheets with high UV irradiation resistance

Abstract

A novel acrylonitrile acrylate copolymer coating was proposed to improve the UV irradiation resistance of poly(vinyl chloride) (PVC) sheets. Its effect on the photoageing properties of the sheets was evaluated by means of Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), yellowness index test, and the oxygen permeability coefficient and mechanical properties measurement. The experimental results show that the novel acrylonitrile acrylate copolymer coating significantly improves the UV irradiation resistance of PVC sheets. Compared with the PVC sheets without coating, the coated PVC sheets show better mechanical properties, lower yellowness index, and smaller oxygen permeability coefficient after UV irradiation. The analysis on the SEM images of the PVC sheets indicates that the coating acts as a film to prevent the PVC sheets from UV energy and oxygen that can accelerate the photochemical reactions of PVC. The FTIR analysis confirms that the coating can slow down the microstructures development of the PVC sheets, also indicating that the coating impeded the photochemical reactions of PVC.

Large stabilizing effect of titanium dioxide on photodegradation of PVC/α‐methylstyrene‐acrylonitrile copolymer/impact modifier‐matrix composites

“…Photooxidization and elimination of hydrogen chloride to form conjugated polyene structures are two major chemical reactions during the UV degradation of PVC. Thus, carbonyl index (CI) and polyene index (PI) are introduced to evaluate the photooxidization degree and could be characterized as follows : …”

“…Here, the peak area of carbonyl group and polyene group is determined in the range of 1800–1670 cm −1 , and 1550–1670 cm −1 , respectively; while 2920 cm −1 that belongs to the C‐H stretching is introduced to eliminate the difference in experiment conditions and operate‐factors.…”

“…Many derivatives of aromatic, nitrogen, and sulfur‐containing organic additives are used to enhance the UV stability of plastics . However, since the factors like nontoxic, nonvolatile, light, chemical, and thermal stability, and price should be fully considered, the inorganic substance may be more suitable for enhancing the UV resistance.…”

Kinetic study of the poly(vinyl chloride)/titanium dioxide nanocomposites photodegradation under accelerated ultraviolet and visible light exposure

“…Polymeric materials, which are exposed to solar ultraviolet (UV) radiation, heat, and moisture, despite of other stress parameters, degrade through processes known as weathering . Weathering of polymeric materials has been the most challenging issue in recent years and due to the increasing use of these substances, their degradation or stability processes has become an area of intense investigations . Among these materials, poly(vinyl chloride) (PVC) with a huge production rate (34 million tons per year) and its good properties such as low production cost, good process ability, and easy modification have been the most interested polymeric materials in research area to study its degradation and stability features .…”

Low‐temperature UV irradiation induced the color change kinetics and the corresponding structure development of PVC film

“…Reversed phenomenon was observed when PVC was blended with chloride polyethylene (CPE) or acrylic resin (ACR) 9. Ye et al16 found that the chromatic aberration was inevitable even though a high ultraviolet (UV) resistance coating was covered on the PVC sheet. Matuana found that the ▵ L *, ▵ a *, ▵ b *, and ▵ E * values of PVC and PVC/wood composite changed notably after photo‐aging.…”