三维石墨烯-吡咯气凝胶/环氧树脂复合材料的制备及其性能EI北大核心CSCD

通过三步法及真空辅助浸渍的方法制备了石墨烯-吡咯气凝胶/环氧树脂复合材料,该复合材料质轻并且内部的多孔石墨烯-吡咯气凝胶具有较为均一的三维结构,在与环氧树脂复合之后,这种三维结构也能很好地保留。石墨烯的三维网络为电子传导提供了快速通道,使材料的导电性能显著提高,仅有0.23%(质量分数)填料含量的石墨烯-吡咯气凝胶/环氧树脂复合材料(1G-1%P,1300℃)的电导率可以达到67.1 S/m。石墨烯-吡咯气凝胶/环氧树脂复合材料(1G-1%P,1300℃)的电磁屏蔽性能在8~12 GHz可以达到33 dB,更重要的是石墨烯-吡咯气凝胶骨架还起到了增强环氧树脂基体力学性能的作用,弯曲强度和弯曲模量与环氧树脂基体相比分别提高了60.93%和25.98%(10G-5%P,180℃),石墨烯-吡咯气凝胶的三维结构可以有效地改善材料整体的电磁屏蔽性能以及力学性能。

Preparation and property of epoxy composites reinforced by three-dimensional graphene-pyrrole aerogel

Lightweight and cellular-structured graphene-pyrrole(G-P)aerogels/epoxy composites were prepared basing on the three-step fabrication process which involving infiltration of epoxy resin into G-P aerogels under vacuum atmosphere.The microstructure of G-P aerogels possesses uniform three-dimensional structure,which can also be preserved well in epoxy composite.The three-dimensional interconnected graphene network serves as fast channels for charge carriers.The conductive property of the composite is improved significantly,67.1 S/m with only 0.23%(mass fraction)filler content(1G-1%P,1300℃).The electromagnetic interference shielding effectiveness(EMI SE)of the composite(1G-1%P,1300℃)can reach 33 dB in the frequency range of 8-12 GHz.More importantly,the G-P aerogel network also enhances the mechanical properties of epoxy matrix.Flexural strength and flexural modulus are increased by 60.93%and 25.98%respectively(10G-5%P,180℃).Implication of the results suggests that the three-dimensional structure is an effective method for preparing composites with both excellent EMI SE and mechanical properties.