纳米Al2O3分布对Al2O3/PE-EVA复合材料导热性能与力学性能的影响

陈金; 王春锋; 王永亮; 韩宝忠; 韩志东

doi:10.13801/j.cnki.fhclxb.20150113.001

纳米Al₂O₃分布对Al₂O₃/PE-EVA复合材料导热性能与力学性能的影响

1.
哈尔滨理工大学材料科学与工程学院, 哈尔滨 150040;
2.
哈尔滨理工大学工程电介质及其应用教育部重点实验室, 哈尔滨 150040

基金项目: 国家自然科学基金(51077030); 教育部科学技术研究重点项目(212040); 教育部新世纪优秀人才支持计划(NCET-12-0705); 黑龙江省电介质工程重点实验室预研基金(DE2012B04); 黑龙江省留学归国人员科学基金(LC2011C15)

详细信息

通讯作者:
韩志东, 博士, 教授, 博士生导师, 研究方向为聚合物基复合材料、阻燃材料。 E-mail: zhidong.han@hrbust.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2014-09-17
- 修回日期: 2015-01-05
- 刊出日期: 2015-10-14

Effects of nano Al₂O₃ distribution on thermal conductivity and mechanical property of Al₂O₃/PE-EVA composites

1.
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2.
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150040, China

摘要

摘要: 旨在将纳米Al₂O₃分散在聚乙烯(PE)和乙烯醋酸乙烯共聚物(EVA)的共混物中, 构建具有选择性分布结构的局域高粒子浓度导热复合材料。采用纳米Al₂O₃为导热填料, 以PE和 EVA为基体树脂, 使用熔融共混法制备了Al₂O₃/PE-EVA导热复合材料。利用选择性溶液萃取方法和SEM研究了PE-EVA共混物的相结构及纳米Al₂O₃在共混物中的分布, 评价了Al₂O₃/PE-EVA复合材料的导热性能与力学性能。结果表明:在PE与EVA质量比为1:1时可获得具有两相共连续结构的共混物;在两相共连续PE-EVA共混物中引入纳米Al₂O₃后, 发现纳米Al₂O₃主要分布在PE相中;纳米Al₂O₃的分布行为及共连续结构的形成有助于提高复合材料的导热性能, 在纳米Al₂O₃质量分数为50%时, 与Al₂O₃/PE复合材料相比, 具有选择分布和相连续结构的Al₂O₃/PE-EVA复合材料的热导率提高了21.2%;随着纳米Al₂O₃质量分数的增加, Al₂O₃/PE-EVA复合材料的拉伸强度与Al₂O₃/PE复合材料的拉伸强度相近, 同时由于EVA相的增韧作用, 其断裂伸长率优于Al₂O₃/PE复合材料。
- Al₂O₃ /
- 聚乙烯 /
- 乙烯醋酸乙烯共聚物 /
- 共连续 /
- 导热性能
Abstract: This paper aims at dispersing nano Al₂O₃ in polyethylene(PE) and ethylene vinyl acetate copolymer (EVA) blends to build thermal conductive composites with high local particle concentration and selective distribution structure. With nano Al₂O₃ as thermal conductive filler, PE and EVA as matrix resin, Al₂O₃/PE-EVA thermal conductive composites were prepared by melt blending method. The phase structure of PE-EVA blends and distribution of Al₂O₃in blends were investigated by selective solution extraction method and SEM. The thermal conductivity and mechanical properties of Al₂O₃/PE-EVA composites were evaluated. The results show that blends with two-phase co-continuous structure are obtained at PE to EVA mass ratio of 1:1. By introducing Al₂O₃ into PE-EVA two-phase co-continuous blends, Al₂O₃ is mainly dispersed in PE phase. The distribution behavior of Al₂O₃ and the formation of co-continuous structure are helpful to improve the thermal conductivity of composites. 21.2% increase of thermal conductivity is obtained for Al₂O₃/PE-EVA composites with selective distribution and co-continuous structure, in comparison to that of Al₂O₃/PE composites at Al₂O₃ mass fraction of 50%. With the increase of Al₂O₃ mass fraction, the tensile strength of Al₂O₃/PE-EVA composites tends to be similar to that of Al₂O₃/PE composites. The elongation at break of Al₂O₃/PE-EVA composites is also superior than that of Al₂O₃/PE composites thanks to the toughing effect of EVA phase.
- Al₂O₃ /
- polyethylene /
- ethylene vinyl acetate copolymer /
- co-continuous /
- thermal conductivity

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