聚酰亚胺基碳纳米微孔材料的制备及性能研究

Preparation and Properties of Polyimide Microcellular Materials with Carbon Nanofillers

采用改性的Hummers法制备了氧化石墨烯(GO),进一步水合肼还原制备了还原氧化石墨烯(RGO)。采用热致相分离法制备了不同含量碳纳米管(CNTs)/RGO填充的聚酰亚胺(PI)基复合微孔薄膜,并用X-射线衍射(XRD)分析了RGO的还原程度,利用红外光谱(FTIR)和扫描电镜(SEM)研究了微孔薄膜的结构,还考察了PI/CNTs/RGO复合微孔薄膜的力学性能和电磁屏蔽性能。结果表明:成功制得了RGO;CNTs/RGO的加入没有影响PI的基本结构;当CNTs和RGO的质量分数均为2%时,泡孔结构规整且孔径较大;CNTs/RGO的加入明显提高了微孔薄膜的力学性能;CNTs的质量分数为2%时,随着RGO含量的增加,微孔薄膜的电磁屏蔽效能也随之提升,当RGO质量分数为1%时,PI/CNTs/RGO复合微孔薄膜的电磁屏蔽效能可达到10~12 dB。

The graphene oxide(GO)was prepared by a modified Hummers method,then reduced graphene oxide(RGO)was prepared by a simple chemical reduction process using hydrazine hydrate as the reducing agent.PI-based microcellular composite films containing different weight of reduced graphene oxide(RGO)/carbon nanotubes(CNTs)were prepared by thermally induced phase separation.The reduction degree of RGO was analyzed by XRD.The structure of microcellular composite films were researched with FTIR and SEM.Then the mechanical properties and electromagnetic interference shielding of the microcellular PI/CNTs/RGO films were investigated.The results indicate that RGO is prepared successfully,and the addition of CNTs/RGO does not affect the structure of polyimide.The films show the best pore morphology uniformity and the larger pore size with 2%loading of CNTs and RGO respectively.The addition of CNTs/RGO can improve the mechanical properties of the microcellular films.It is observed that electromagnetic interference shielding property of microcellular PI/CNTs/RGO film containing 2%CNTs improves when increasing the RGO loading.The microcellular film with 1%loading of RGO exhibited shielding levels is 10~12 dB.