石墨-聚酰亚胺复合材料的制备与介电性能研究  

Preparation and dielectric properties of graphite-polyimide composites

作　　者：袁静[1] 袁三魁 YUAN Jing;YUAN Sankui(School of Civil Engineering and Architecture,Nanchong Vocational and Technical College,Nanchong 637131,China;College of Materials Science and Engineering,Sichuan University,Chengdu 610042,China)

机构地区：[1]南充职业技术学院土木与建筑工程系,四川南充637131 [2]四川大学材料科学与工程学院,成都610042

出　　处：《功能材料》2023年第5期5113-5118,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(81360254)。

摘　　要：聚酰亚胺因其具有优异的机械性能、良好的耐化学性能和低的吸水性能等被广泛应用于新型建筑材料、微电子、航天航空等领域。采用改进的Hummer化学法制备了氧化石墨,随后通过溶液共混法制备出不同质量分数(0,1%,2%,3%,4%)石墨掺杂的石墨-聚酰亚胺复合胶粘剂和石墨-聚酰亚胺复合薄膜,通过FT-IR、SEM、力学性能测试、热失重分析等对复合体系进行了表征。结果表明,石墨的掺入并未影响聚酰亚胺的基本结构,掺入适量石墨后,石墨和聚酰亚胺均匀结合,复合胶粘剂的断面粗糙度增加,稳定性增强。随着石墨掺杂量的增加,复合胶粘剂的剪切强度先上升后下降,当石墨的掺杂量为3%(质量分数)时,复合胶粘剂的剪切强度达到最大值11.67 MPa。适量石墨的掺入可以有效改善聚酰亚胺的热稳定性和介电性能,随着石墨掺杂量的适当增加,复合薄膜的800℃的残余量和介电常数增大,介电损耗降低,当石墨的掺杂量为3%(质量分数)时,复合薄膜的800℃残余量达到了最大值57.74%,介电损耗最低为0.016,对应的介电常数为12.7。综合分析可知,石墨的最佳掺杂量为3%(质量分数)。Polyimide is widely used in new building materials,microelectronics,aerospace and other fields because of its excellent mechanical properties,good chemical resistance and low water absorption.Graphite oxide was prepared by the improved Hummer chemical method,and then graphite-polyimide composite adhesive and graphite-polyimide composite film with different mass fractions(0,1%,2%,3%,4%)were prepared by solution blending method.The composite system was characterized by FT-IR,SEM,mechanical property test and thermogravimetric analysis.The results showed that the basic structure of polyimide wasn’t affected by the addition of graphite.After the addition of appropriate amount of graphite,the graphite and polyimide were uniformly combined,and the section roughness and stability of the composite adhesive were increased.With the increase of graphite doping,the shear strength of the composite adhesive increased first and then decreased.When the amount of graphite doping was 3 wt%,the shear strength of the composite adhesive reached the maximum value of 11.67 MPa.The thermal stability and dielectric properties of polyimide could be effectively improved by adding appropriate amount of graphite.With the appropriate amount of graphite doping,the residual amount and dielectric constant of the composite film at 800℃increased,and the dielectric loss decreased.When the doping amount of graphite was 3 wt%,the residual amount of the composite film at 800℃reached the maximum value of 57.74%,the minimum dielectric loss was 0.016,and the corresponding dielectric constant was 12.7.Comprehensive analysis showed that the optimum doping amount of graphite was 3 wt%.

关 键 词：石墨-聚酰亚胺 Hummer化学法 力学性能 热稳定性 介电性能 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]