膨胀石墨/聚醚砜复合材料的制备及力学性能  

Preparation and Mechanical Properties of Expanded Graphite/Polyethersulphone Composites

作　　者：杨育林[1,2] 闫世程 薛亚红[1] 董琴[1] 段昌生 包倩倩[1] 

机构地区：[1]燕山大学机械工程学院,秦皇岛066004 [2]燕山大学自润滑关节轴承共性技术航空科技重点实验室,秦皇岛066004

出　　处：《材料导报》2016年第16期15-20,共6页Materials Reports

基　　金：河北省科技支撑计划项目(12276716D)

摘　　要：采用微波辐射法制备了膨胀石墨(EG),将其作为增强相加入到聚醚砜(PES)基体中,利用溶液共混法和真空辅助模压成型工艺得到EG/PES复合材料,使用SEM、FTIR和XRD等分析手段表征了EG及其复合材料的微观结构和性能,并对复合材料的力学性能进行了测试。结果表明:PES分子插入到了EG片层内部,并且EG与PES分子之间产生了氢键作用;当EG含量为5.0%(质量分数)时,复合材料的拉伸和弯曲强度达到最大值,分别为94.6 MPa和146.7 MPa,较树脂基体提升了10.5%和7.3%;EG在PES基体内的分散性直接影响了复合材料的力学性能,嵌入到复合材料内部的EG不仅能够改变微观裂纹的走向,还能阻止其进一步蔓延和扩展,改善复合材料内部的应力分布情况。Expanded graphite（EG）was prepared by microwave irradiation,and subsequently incorporated into polyethersulphone（PES）matrix to strengthen and toughen this polymer.EG/PES composites were fabricated via solution blending and vacuum-assisted compression molding.The microstructure and properties of EG and its composites were characterized by SEM,FTIR and XRD.The mechanical properties of EG/PES composites were tested as well.Polyethersulphone molecules had inserted into the EG sheets and the results indicated that hydrogen-bond interaction was generated between EG and PES molecules.The comprehensive mechanical properties of PES composites could be improved by introducing EG.The tensile and flexural strength of EG/PES composites with EG addition of 5.0wt%arrived at the highest values of 94.6 MPa and 146.7MPa,which were 10.5% and 7.3% higher than those of matrix resin,respectively.The mechanical properties of EG/PES composites depended on the dispersion of EG in PES matrix.The EG sheets embedded into PES composites not only changed the direction of microscopic cracks,but also prevented the spread and extension of them further,and thus improving the stress distribution in composite materials.

关 键 词：膨胀石墨 聚醚砜 复合材料 力学性能 微观裂纹 

分 类 号：TB332[一般工业技术—材料科学与工程]