光缆护套料用高密度聚乙烯/线型低密度聚乙烯的界面作用与流变行为  

Interfacial Action and Rheological Behavior of High Density Polyethylene/Linear Low Density Polyethylene for Cable Sheathing Materials

作　　者：龙世军[1,2] 邱迪 王鹏 黎勋 祁红义 李学锋 Shijun Long;Di Qiu;Peng Wang;Xun Li;Hongyi Qi;Xuefeng Li(Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China;School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,China;Hubei Chutian Communication Materials Co.,Ltd.,Xiaogan 431602,China)

机构地区：[1]湖北工业大学,绿色轻工材料湖北省重点实验室,湖北武汉430068 [2]湖北工业大学材料与化学工程学院,湖北武汉430068 [3]湖北楚天通讯材料有限公司,湖北孝感431602

出　　处：《高分子材料科学与工程》2020年第4期67-74,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51603065);湖北工业大学绿色工业科技引领计划(CPYF2018001)。

摘　　要：采用熔融共混法制备了光缆护套料用高密度聚乙烯(HDPE)/线型低密度聚乙烯(LLDPE)与HDPE/茂金属线型低密度聚乙烯(m-LLDPE)2种共混物,讨论了共混物HDPE/LLDPE和HDPE/m-LLDPE及中密度聚乙烯(MDPE)与铝塑带之间的热合强度,并研究了共混物的力学性能、松弛行为及组分间的相容性。研究结果表明,HDPE/LLDPE(7∶3)共混物与铝塑带热合强度最高(27.2N/cm);熔融状态下,低频区HDPE/LLDPE的lgG′-lgω与线性偏离,且松弛指数(λ)随HDPE含量增加先减小后增大,表明分子链缠结先增强再减弱,为非均相体系;HDPE/LLDPE只表现出1个熔融峰,表明共混物组分具有良好相容性;因分子界面多重叠,HDPE/LLDPE(7∶3)具有更小分散相尺寸(2.74nm)与更高界面层厚度(1.02nm),组分相容性最好,且与热熔胶乙烯-醋酸乙烯共聚物(EVA)的界面张力最小。可见,采用来源广、价格相对低廉的HDPE与LLDPE共混可实现替代MDPE制备光缆护套料。Two blends(HDPE/LLDPE and HDPE/m-LLDPE)used for cable sheathing were prepared by melt blending.The sealing strength between HDPE/LLDPE,HDPE/m-LLDPE blends,MDPE and aluminum-plastic tape,as well as the mechanical properties,relaxation behavior and compatibility between the components of the blends were investigated.The results show that the HDPE/LLDPE(7∶3)blend has the highest heat strength(27.2 N/cm)with the aluminum plastic strip;in the molten state,the lgG′-lgωof HDPE/LLDPE deviates linearly in the low frequency region,and the relaxation indexλdecreases first and increases with the increase of HDPE content,indicating that the molecular chain entanglement increases first and weakens then,presenting a heterogeneous system;HDPE/LLDPE blend only shows a melting peak,indicating good compatibility between the two components;due to the overlapping of molecular interfaces,HDPE/LLDPE(7∶3)which shows the lowest interfacial tension with EVA has the smaller dispersed phase size(2.74 nm)and the higher interfacial layer thickness(1.02 nm),indicating the best component compatibility.It can be seen that the use of a wide range of relatively inexpensive HDPE and LLDPE blends can be used to prepare cable sheathing materials instead of MDPE.

关 键 词：光缆护套料 高密度聚乙烯 线型低密度聚乙烯 中密度聚乙烯 热合强度 相容性 

分 类 号：TN818[电子电信—信息与通信工程]