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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．
The structures of crosslinked sites of low density polyethylene (LDPE) and model compounds induced by photoinitiator benzophenone (BP) and the photodegradation products of BP and their formation mechanism were studied by high resolution NMR and fluorescence spectroscopy. . For the first time, H-type and Y-type long chain branching points in LDPE (XLPE) were observed and identified. It is estimated that in the XLPE samples with 5-1% Rates ranged from 5.7 to 16.9 and from 7.6 to 21.6 structural units respectively. The main product of photolysis of BP in the photoinitiation process was identified as benzoguanols, and the possibility of existence of a small amount of α, α ’, β-alkanols was discussed.