采用模型化合物测定LDPE支化度的红外光谱法研究  

Application of model compounds in determination of branching degree of LDPE with infrared spectroscopy

作　　者：周林璆 宋丹[1] 裴鑫杰[1] Zhou Linqiu;Song Dan;Pei Xinjie(Lanzhou Petrochemical Company,PetroChina,Lanzhou 730060,China)

机构地区：[1]中国石油天然气股份有限公司兰州石化分公司,甘肃兰州730060

出　　处：《合成树脂及塑料》2022年第6期17-20,共4页China Synthetic Resin and Plastics

摘　　要：研究了采用模型化合物测定低密度聚乙烯(LDPE)支化度的红外光谱分析方法。使用长链正构烷烃作为模型化合物,利用模型化合物在1378 cm^(-1)处甲基特征吸收峰峰高和2019 cm^(-1)处的内标峰峰面积计算甲基在亚甲基碳链中的浓度,建立校准曲线,从而得到LDPE的支化度。结果表明:该方法的重复性较好;与高分辨固体核磁共振法相比,该方法准确性较高。Model compound was used to determine the branching degree of low density polyethylene(LDPE)with infrared spectroscopy.Long-chain n-alkanes were used as model compounds,whose peak height of methyl characteristic absorption peak at 1378 cm^(-1) and the peak area of internal standard at 2019 cm^(-1) were used to calculate the concentration of methyl in methylene carbon chain and establish the calibration curve to obtain the branching degree of LDPE.The results show that the method is good in repeatability and is more accurate than high resolution solid nuclear magnetic resonance spectroscopy.

关 键 词：低密度聚乙烯 红外光谱法 支化度 模型化合物 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]