HDPE/CaCO_3纳米复合材料的自由体积及其界面特性  

Free Volume and Interface Properties of Nanocomposites HDPE/CaCO_3

作　　者：张明[1] 方鹏飞[1] 刘黎明[1] 王少阶[1] 

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2003年第5期601-604,共4页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(50273028);湖北省科技攻关项目资助(2002A105A05)

摘　　要：采用熔融共混方法,制备了不同纳米碳酸钙(CaCO3)颗粒含量的高密度聚乙烯(HDPE)纳米复合材料,测量了复合材料的力学性能,观察到在纳米颗粒含量为6%时,其冲击强度有较大提高.同时,用正电子湮没寿命谱(PALS)研究了不同纳米颗粒含量的纳米复合材料的自由体积特性和界面信息,并探讨了它们对材料宏观力学性能的影响.结果发现,复合材料中最长寿命τ3变化不大,但其强度I3有明显减小;第二寿命分量与纳米复合材料中纳米CaCO3颗粒和HDPE链段之间的界面结构密切相关.A series of High Density Polyethylene/CaCO_(3) nanocomposites have been prepared by melting proceeding. The impact strength of the nanocomposite has been improved at the 6% CaCO_(3) content. Positron lifetime spectroscopy has been applied to study the free volume and interface properties of the nanocomposites in the room temperature. It is observed that, first, positronium(Ps) is formed and annihilates in the free-volume hole of HDPE and the free-volume fraction decreases with the increasing fraction of the CaCO_(3) nanoparticles in the nanocomposites; second, the positron lifetime τ_2 and its intensity I_2 are strongly affected by the formation of the interface layer between CaCO_(3) nanoparticles and HDPE matrix.

关 键 词：HDPE/CaC03纳米复合材料 自由体积 界面特性 熔融共混方法 纳米碳酸钙 聚乙烯 力学性能 

分 类 号：TB383[一般工业技术—材料科学与工程]