中文摘要：

以邻甲酚、甲醛、二甲胺和正十二硫醇为原料合成了2，4-二（正十二烷基硫亚甲基）-6-甲酚（DD），并通过核磁共振检测证明了其结构。采用热失重和haake流变仪等测定了DD对PVC的稳定作用，并与传统的钙，锌和甲基锡热稳定剂进行比较。结果表明DD对PVC的稳定性优于参比样品。在氧气存在下，DD对PVC的热稳定性与氮气条件下相当，这主要是由于DD具有捕捉聚合物过氧化自由基、分解氢过氧化物和取代活性氯的功能。

英文摘要：

2,4-bis（dodecylthiomethyl）-6-methyl phenol （DD） was synthesized with o-cresol, dimethylamine, formaldehyde and n-dodecanethiol. The structure of DD was identified by IH NMR. Stabilizing efficiency of DD on PVC was tested by way of thermal weightlessness and Haake polymerdrive and compared with that of conventional Ca-Zn soap and methyltin thermal stabilizer. Testing results showed that DD exhibited greater efficiency than either of these stabilizers. Thermal stability of DD on PVC with oxygen present was almost the same as with nitrogen present which was attributed mainly to DD＇ s capacity to trap macroalkylperoxy radicals, decompose hydroperoxides in PVC and displace halogen from the thermally labile structures （e.g. internal allylic and tertiary chloride） in PVC.