低密度聚乙烯光引发交联机理

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首次用溶液高分辨 ̄(13)CNMR研究了由二苯甲酮光引发低密度聚乙烯(LDPE)交联所产生的交联结构,现已观测和鉴定了H型和Y型长链支化两类交联点。对于熔融态紫外光交联5-10s的LDPE样品,其H型和Y型交联点的浓度据估测分别为一万个碳原子中有5.7-16.9和7.6-21.6个结构单元。 For the first time, the crosslinked structure of LDPE initiated by benzophenone photoinitiator was studied by high-resolution (13) CNMR. It has been observed and identified that H-type and Y-type long chain branches Two types of crosslinking points. For LDPE samples with 5-10 s of cross-linked UV-C, the H- and Y-type cross-linking sites were estimated to have 5.7-16.9 and 7.6-21, respectively, of the 10,000 carbon atoms .6 structural units.
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