Abstract

In the article, PVDF-based composites reinforced by MWCNT and phenolic epoxy resin were prepared by solution casting method to get a material with excellent mechanical properties and high dielectric properties and breakdown strength when conductor is as filler. The experimental results demonstrate that dielectric constant of m-MWCNT/EP/PVDF composites (ε_r = 32 at 100 Hz) is twice times higher than that of the EP/PVDF composites, and is about three times higher than that of the pure PVDF. The dielectric loss is not higher than that of the others (Tan δ = 0.3 at 100 Hz). The breakdown strength of the composites is higher than 100 MV/m, which is superior to most of composites modified with conductors. The breakdown strength for most of composites modified with conductors is under 100 MV/m. The elongation at break of m-MWCNT/EP/PVDF composites keeps 500% and the tensile yield strength increases continuously.

摘要

文章采用溶液浇注法制备了多壁碳纳米管和酚醛环氧树脂增强的PVDF基复合材料，得到了一种具有优良力学性能和高介电性能以及导体作为填料时的击穿强度的材料。实验结果表明，m-MWCNT/EP/PVDF复合材料的介电常数 （ε _r = 32 at 100 Hz）是EP/PVDF复合材料的两倍，是纯PVDF的三倍左右. 介电损耗不高于其他（Tan  δ = 0.3 在 100 Hz）。复合材料的击穿强度高于100 MV/m，优于大多数用导体改性的复合材料。大多数用导体改性的复合材料的击穿强度低于 100 MV/m。m-MWCNT/EP/PVDF复合材料的断裂伸长率保持在500%，拉伸屈服强度不断提高。