摘要
用溶液高分辨核磁共振和荧光光谱等方法研究了由光引发剂二苯甲酮（BP）引发低密度聚乙烯（LDPE）和模型化合物交联点的结构、BP的光解产物及其形成机理．首次观测和鉴定了光交联LDPE（XLPE）中的H型和Y型长链支化交联点；据估计在熔融态紫外光照5～1O的XLPE样品中H型和Y型文联点的产率分别为5．7～16．9和7.6～21．6个结构单元．确定了BP在光引发过程中光解的主要产物为苯并哪醇，并探讨了存在少量α，α’一二本基烷醇的可能性．
Crosslink structures, photolytic products of benzophenone(BP) as a photoinitiator and their formation mechanisms in BP-photoinitiated crosslinking of low density polyethylene (LDPE ) and its model compounds have been studled by solution state high resolution 13C NMR and fluorescence spectroscopy etc.. Both H-links and Y--type long branches in the photocrosslinked LDPE (XLPE) have been ohserved and identified for the first time. The concentrations of H- and Y-type crosslinks are estimated to be 5. 7 ~ 16. 9 and 7. 6 ~ 21. 6 structure units per 10 000 carbon atoms with the XLPE samples UV-irracliated for 5~ 10 seconds in the melt, respectively. The main photolytic product of BP identified is benzopinacol.There are indications that a small amount of a-alkylbenzhydrols are also possibly formed by the reactions of ketyl radicals with alkyl radicals.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第2期317-322,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
国家教育委员会留学归国人员基金
关键词
聚乙烯
二苯甲酮
交联点结构
光解产物
Low density polyethylene (LDPE ), Benzophenone, Crosslink structure, Photolytic products, Photocrosslinking mechanism
