HALS和抗氧剂对PE辐射致色的影响  

Effect of HALS and Antioxidants on Coloration of PE

作　　者：汪辉亮[1] 王春[1] 陈文琇[1] 

机构地区：[1]北京师范大学化学系,北京100875

出　　处：《应用化学》2001年第7期548-551,共4页Chinese Journal of Applied Chemistry

基　　金：北京师范大学青年科学基金资助项目

摘　　要：研究了受阻胺类光稳定剂 (HALS)及各种抗氧剂对聚乙烯辐射致色的影响 .发现 HALS和各种抗氧剂均能减少 PE的辐射致色 .在辐照剂量低于 1 0 0 k Gy时 ,添加五甲基 HALS的聚乙烯的黄度比添加相应的四甲基 HALS的聚乙烯的黄度高 ;而在辐照剂量高于 1 0 0 k Gy时 ,结果相反 .在相同辐照剂量下 ,添加受阻酚类抗氧剂 1 0 1 0的 PE的黄度比添加 1 0 76或 1 0 98的 PE的高 .添加氢过氧化物分解剂型抗氧剂 80 2的 PE的黄度比添加 1 68的略低 .受阻酚类抗氧剂防止 PE辐射致色的效果一般要比氢过氧化物分解剂型抗氧剂好 .并讨论了 HALS和抗氧剂防止 PE辐射致色的原因 .The effects of some hindered amine light stabilizers(HALS) and antioxidants on the radiation-induced coloration of polyethylene(PE) are studied by measuring the yellowness index(YI) of PE. It is found that all the HALS and antioxidants examined are effective in preventing PE from radiation-induced coloration. The YIs of PE with pentamethyl HALS(PMPM, PPMPM) are a little higher than YIs of PE added corresponding tetramethyl HALS(TMPM, PTMPM) when the irradiation dose is lower than 100 kGy, but when the irradiation dose is higher than 100 kGy, the YI of PE added pentamethyl HALS is low. Pentamethyl HALS is more effective in preventing PE from radiation-induced coloration when irradiation dose is high. The YI of PE added Irganox 1010 is the highest among those of PE added hindered phenol antioxidant Irganox 1076, Irganox 1010 or Irganox 1098 separately. The YI of PE added Irganox PS802 is lower than that of PE added Irgafos 168. Commonly, hindered phenol antioxidants are more effective than hydroperoxide decomposer antioxidants in preventing PE from radiation-induced coloration. The role of HALS and antioxidants played in preventing PE from radiation-induced coloration is discussed.

关 键 词：聚乙烯 辐射致色 受阻胺类 光稳定剂 抗氧剂 

分 类 号：O632.12[理学—高分子化学] O631.34[理学—化学]