填料形貌对导热胶渗流阈值的影响研究  

The study of the relationship between the slenderness ratio of fillers and the percolation threshold

作　　者：夏艳平[1] 陶宇[1] 张国庆[2] 吴希俊[3] 苏浩 梁平辉 吴海平[1,2] 陶国良[1] 

机构地区：[1]常州大学材料与工程学院微纳米复合材料中心实验室,江苏常州213164 [2]浙江理工大学先进纺织材料与制备技术教育部重点实验室,浙江杭州310018 [3]浙江大学纳米科学与技术中心,浙江杭州310027 [4]常熟佳发化学有限责任公司,江苏苏州215533

出　　处：《功能材料》2010年第A02期357-360,364,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(59971045);江苏省基础研究计划资助项目(BK2009570);教育部重点实验室开放基金(2008005);常州市工业科技攻关资助项目(CE20090043)

摘　　要：采用微波辅助乙二醇法,通过调节微波处理时间,制备了不同长径比的纳米银材料。用TEM和XRD对不同长径比的纳米银进行了表征。以不同长径比的纳米银作为导热填料制备导热胶,研究发现对于填充不同长径比的纳米银材料,导热胶的阈值填充量是不同的。长径比越大阈值越小。运用修正的Nielsen-lewis阈值理论对这一实验现象进行了合理解释,模拟结果表明,修正的阈值理论与实验结果非常吻合。Nanostructured silver with different slenderness ratio was prepared by a microwave（MW） assisted method.The nano-silver were characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）.Thermal conductive adhesive（TCA） were prepared by using the different slenderness ratio nano-silver as the thermal conductive filler.The thermal conductivity of the adhesive was measured.The result indicated that the slenderness ratio of the nano-silver had important influence on it＇s percolation threshold.Three kinds of percolation threshold theory were used to simulate the experiment results.The simulation results obtained by using modified Nielsen-lewis model were good agree with the experimental results.

关 键 词：纳米银 导热胶 渗流阈值 热导率 

分 类 号：TB333[一般工业技术—材料科学与工程]