Synthesis of CaZnAl-CO₃ ternary layered double hydroxides and its application on thermal stability of poly (vinyl chloride) resin

Abstract

In this work, hydrothermal method was used to prepare the CaZnAl-CO₃ ternary layered double hydroxides (CaZnAl-CO₃-LDHs) with various Ca/Zn/Al molar ratios, which were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR) and scanning electron microscopy (SEM) techniques. The obtained results demonstrate that the samples were well-crystallized and flake-structured. The CaZnAl-CO₃-LDHs used alone for thermal stability of poly (vinyl chloride) (PVC) resin, with different Ca/Zn/Al molar ratios and varying additive amounts, were investigated through the tests such as static thermal aging, mass loss and congo red, respectively. The optimum Ca/Zn/Al molar ratio and additive amount were 3.6:0.4:2 and 5 phr (parts per hundred PVC resin), respectively. In addition, the synergistic effects of Ca3.6Zn₀.4Al₂-CO₃-LDHs and CaSt2 were discussed in detail, showing better thermal stability compared with Ca3.6Zn_0.4Al₂-CO₃-LDHs used alone, and the optimum additive amounts of Ca3.6Zn_0.4Al₂-LDHs and CaSt₂ were 6 and 1.0 phr, respectively.

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