磁场驱动法制备低热膨胀环氧梯度功能材料  

Preparation of low thermal expansion epoxy functionally gradient materials by magnetic field driving

作　　者：孙洁 陈忠涛 康明[1] 赵秀丽[1,2] SUN Jie;CHEN Zhongtao;KANG Ming;ZHAO Xiuli(School of Materials Science and Engineering, Southwest University of Science and Technology,Mianyang 621010,China;Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院化工材料研究所,四川绵阳621900

出　　处：《功能材料》2021年第7期7179-7185,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21805253);中国工程物理研究院创新发展基金资助项目(CX201911)。

摘　　要：为降低环氧树脂的热膨胀系数,基于负热膨胀填料LaFe_(10.5)Co_(1.0)Si_(1.5)制备了低热膨胀的LaFe_(10.5)Co_(1.0)Si_(1.5)/环氧树脂复合材料,研究了LaFe_(10.5)Co_(1.0)Si_(1.5)填料含量对材料力学性能和热膨胀性能的影响规律,并通过磁场驱动法诱导填料粒子在树脂基体中的梯度分布,制备了热膨胀梯度变化的功能材料。结果表明,LaFe_(10.5)Co_(1.0)Si_(1.5)可以有效降低环氧树脂基复合材料在228~323 K间的线膨胀系数,加入70 wt%的LaFe_(10.5)Co_(1.0)Si_(1.5)填料,复合材料线膨胀系数即可降低了58%。此外,通过TGA、导热系数、拉伸强度等性能的变化规律证明,在外加磁场的驱动下LaFe_(10.5)Co_(1.0)Si_(1.5)粒子顺着磁场方向呈现梯度分布。同时,复合材料的热膨胀性能也呈现出显著的梯度变化。这证明了磁场驱动法是一种制备低热膨胀环氧梯度材料的有效简便方法。In order to reduce the thermal expansion coefficient of epoxy resin,in this paper a low thermal expansion LaFe_(10.5)Co_(1.0)Si_(1.5)/epoxy resin composite material is prepared based on the negative thermal expansion filler LaFe_(10.5)Co_(1.0)Si_(1.5).Then the influence of LaFe_(10.5)Co_(1.0)Si_(1.5) filler content on the mechanical properties and thermal expansion properties of the materials is studied.And the gradient distribution of filler particles in the resin matrix is induced by the magnetic field driving method to prepare functional materials with gradient thermal expansion.The results show that LaFe_(10.5)Co_(1.0)Si_(1.5) can effectively reduce the linear expansion coefficient of epoxy resin-based composites between 228-323 K,and the linear expansion coefficient of the composites can be reduced by 58%when adding 70%LaFe_(10.5)Co_(1.0)Si_(1.5) filler.In addition,the variation regularities of TGA,thermal conductivity,tensile strength and other properties prove that LaFe_(10.5)Co_(1.0)Si_(1.5) particles show a gradient distribution along the direction of the magnetic field driven by an external magnetic field.Meanwhile,the thermal expansion properties of the composite materials also show a significant gradient change.These prove that the magnetic field driving method is an effective and simple method for preparing low thermal expansion epoxy gradient materials.

关 键 词：负热膨胀 环氧树脂 热膨胀性能 磁场驱动 梯度功能材料 

分 类 号：TQ323[化学工程—合成树脂塑料工业]