硬脂酸镧对PVC热稳定作用机理的研究

采用紫外光谱和红外光谱分析方法，研究了硬脂酸镧对PVC的热稳定机理。结果表明：硬脂酸镧对PVC具有明显的热稳定作用；硬脂酸镧在PVC降解过程中对共轭双烯结构的形成，不能起到显著的抑制作用；硬脂酸镧能与PVC中的氯原子发生作用，使得C—Cl键趋于稳定，使得PVC在降解过程中1，3重排更为困难，因而明显抑制共轭多烯结构的形成；并根据PVC降解的协同消除机理，作出了很好的解释。

Study on Thermal Stabilization Mechanism of PVC by Lanthanum Stearate

The mechanism of thermal stabilization of lanthanum stearate on PVC was studied by means of UV spectra and IR spectra. The results showed lanthanum stearate had obvious thermal stabilization effect on PVC, but could not restrain the increase of conjugated double bond effectively during the degradation of PVC; however, it could interact with the chlorine in PVC to make C-Cl bond to be stabilized and 1, 3 rearrangement of chlorine more difficult, so as to restrain the formation of conjugated polyene, and it cold be well explained by the concerted elimination mechanism of the degradation of PVC.