【摘要】 本文报导了高密度聚乙烯在熔融态真空下辐照后的交联效果。直接由高分辨碳-13核磁共振(¹³CNMR)谱的指认及定量研究结果表明:在辐照熔态聚乙烯中产生的主要交联类型有两种;H型及Y型结构,并且生成H型的G值大于Y型的G值。Y型交联的形成对样品的种类有较大的依赖性。这些结果与进一步探讨聚乙烯辐射化学效应和交联机制将有重要意义。更多还原

【Abstract】 Cross-linked samples of polyethylenes (PE) and liner paraffins (n-C36H74) were prepared in vacuum at the molten states and exposed to γ-ran of 50Co.Crosslinked concentrations-were directly determined by 18C NMR-spectroscopy, as apposed to results of Randall et al. It was concluded from results of measurements that major structural units identified are the H-type and the Y-type of long-chain branches during radiation. It also had been found that Gn-values of cross-linking H-type is greater than Gy-values of Y-type for the sample studed here, and GY-values greatly were dependent on polyethylene species.更多还原