The Effect of Diphenylphosphate Intercalated Magnesium Aluminum Lanthanum Hydrotalcite on the Thermal Stability and Mechanical Properties of Poly(Vinyl Chloride)

Magnesium aluminum lanthanum hydrotalcite (MgAlLa-CO₃-LDHs) was modified with diphenyl phosphate to obtain diphenyl phosphate-intercalated magnesium aluminum lanthanum hydrotalcite (MgAlLa-P-LDHs). The prepared materials, MgAlLa-CO₃-LDHs and MgAlLa-P-LDHs, were subjected to characterization techniques, including Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM), to ascertain their structural and morphological characteristics. Subsequently, these hydrotalcite-based thermal stabilizers were incorporated into polyvinyl chloride (PVC) to fabricate composite materials. The comprehensive evaluation of the composite materials’ thermal stability, mechanical properties, and plasticization performance was conducted through thermal aging tests, tensile experiments, and plasticization tests. The research findings indicate a significant enhancement in the thermal stability of PVC materials with the introduction of hydrotalcite-based thermal stabilizers. Additionally, there were observed improvements in mechanical properties and plasticization performance. This study provides a thorough experimental and theoretical foundation for the application of rare earth hydrotalcite-based thermal stabilizers in PVC, offering valuable insights for the development and application of environmentally friendly PVC thermal stabilizers.