Abstract
Lanthanum-pentaerythritol (La-PE) alkoxide, a polyol-based metal alkoxide, had been synthesized and used as a thermal stabilizer for polyvinylchloride (PVC). Thermogravimetric (TG), differential thermal analysis (DTG), mass spectrum (MS), and Fourier transform infrared (FTIR) spectroscopy were used to confirm the synthesis reaction. The thermal stability of rigid PVC stabilized with La-PE was tested by means of the Congo Red test, conductivity test, thermal aging test, thermal gravimetric analysis (TGA), and UV-visible (UV-vis) spectroscopy. The results showed that addition of La-PE could significantly prolong static stability time of PVC and increase the apparent activation energy for degradation reaction. The oven aging test showed that La-PE could improve the initial color of PVC. Moreover, addition of La-PE could significantly reduce the concentrations of the conjugated double bonds of PVC and reduce weight loss. The possible thermal stability mechanism had also been discussed. Besides having good ability to neutralize hydrochloric acid (HCl), La-PE could substitute or inactivate the labile chlorine atoms in the PVC chains. J. VINYL ADDIT. TECHNOL., 2015. © 2015 Society of Plastics Engineers
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