Pentaerythritol-aluminum (PE-Al) was synthesized by a solid-phase reaction in this study. The formation and characteristics of PE-Al were confirmed by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). SEM images showed that the shapes of PE-Al particles were spherical and the average size was around 23 nm. The thermal properties of rigid poly(vinyl chloride) (PVC) with PE-Al were tested by Congo red test, thermal aging test, conductivity test, thermogravimetric analysis (TGA), and UV-visible spectroscopy test. The results showed that combination of PE-Al, in comparison with commercial thermal stabilizers, presented an obvious improvement in stabilization efficiency of PVC. Moreover, addition of PE-Al could significantly prolong static stability time of PVC, reduce weight loss, and improve the initial color of PVC films.
Pentaerythritol-zinc (called Penzinc), which is a novel thermal stabilizer for PVC, was synthesized, and its performance was characterized during the thermal processing of PVC. The stabilization effects of this new stabilizer combined with calcium stearate (CaSt 2 ) and stearoyl benzoyl methane (b-diketone) were investigated using conductivity tests, thermal aging tests, and torque rheometry tests. The results revealed that the addition of Penzinc can improve the color and thermal stability of PVC in both static and dynamic tests. There are no obvious synergistic effects between Penzinc and CaSt 2 . However, the synergistic action between Penzinc and b-diketone is excellent. The thermal stability mechanisms of Penzinc and b-diketone are also discussed with the help of quantum chemical calculations.
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