功能梯度菠萝纤维聚吡咯复合材料在热载荷下经向和纬向的导电性能

Natural fiber (NF) products provide ecofriendly and low-cost solutions for sustainable product development for energy storage applications. However, imparting electrical conductivity to NF is a challenging task due to its intrinsic non-conductivity properties and hydrophilic nature. The present work aims to develop an electrically conductive, functionally graded woven pineapple fiber (FGPAF) through functionalization of rGO/CB on the fiber surface. The FGPAF surface was further modified with PPy to create a functionally graded woven pineapple composite (FGPAC) with improved electrical conductivity compared to FGPAF by altering the Wt.%. The electrical property of FGPAC was optimized by varying the Wt. % PPy and at a constant Wt.% rGO/CB. FE-SEM, FT-IR, and XRD were used to study the influence of rGO/CB and PPy functionalization on the microstructure, functional groups, and crystallographic structures of the nanoparticles. The four-point probe technique was used to measure the electrical conductivity of FGPAF/FGPAC in both the warp and weft directions. The experimental results showed that the functionalization of 10 Wt.% of rGO in 2.5 Wt.% of CB (FGPAF2) resulted in higher average electrical conductivity of 18.15 S/cm and 18.90 S/cm in the warp and weft directions, respectively. Furthermore, the functionalization of 5 Wt.% PPy (FGPAC5) exhibited the highest average electrical conductivity of 35.91 S/cm in warp and 36.04 S/cm in weft directions. The electrical conductivity of FGPAC5 was also examined under high thermal loading conditions, and the results indicated an increase in conductivity to a promising range of 120% at 100 ℃. Similar electrical conductivity across the entire fiber surface suggests that PA fibers are a potential candidate for the development of electrode materials.