硬脂酸镧对PVC热稳定作用机理的研究  

Study on Thermal Stabilization Mechanism of PVC by Lanthanum Stearate

作　　者：蒋金博[1] 邓剑如[1] 奚家国[1] 周飞[1] 蒋向[1] 

机构地区：[1]湖南大学化学化工学院,湖南长沙410082

出　　处：《塑料工业》2006年第6期54-56,60,共4页China Plastics Industry

基　　金：湖南省杰出中青年专家基金项目(VIJZYZ101)

摘　　要：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。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.

关 键 词：硬脂酸镧 PVC 热稳定作用机理 紫外光谱 红外光谱 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]