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首页> 外文期刊>Composites Science and Technology >Exploring polyethylene/polypropylene nonwoven fabrics derived from two- dimensionally co-extruded composites: Effects of delamination, consolidation, drawing and nanoparticle incorporation on mechanics, pore size and permeability
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Exploring polyethylene/polypropylene nonwoven fabrics derived from two- dimensionally co-extruded composites: Effects of delamination, consolidation, drawing and nanoparticle incorporation on mechanics, pore size and permeability

机译：探索源自二维共挤复合材料的聚乙烯/聚丙烯无纺布：分层，固结，拉伸和纳米粒子掺入对力学，孔径和渗透性的影响

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摘要

Co-extruded fiber-like composites after delamination facilitate the synchronous production of dual component fibers. In this study, high-density polyethylene (HDPE)/polypropylene (PP)/polystyrene (PS) and low-density polyethylene (LDPE)/PP/PS composites (fiber precursor) were melt-processed by using multilayer coextrusion. Each composite was uniaxially drawn to enhance mechanical robustness of HDPE, LDPE and PP fiber-like domains. Following the drawing process, the sacrificial PS layer was removed, and a combination of hydroentanglement, needle-punching, and compression molding was utilized to formulate dual-component HDPE/PP and LDPE/PP nonwoven mats. Drawing of the coextruded fiber precursor enhanced the tensile strength of the HDPE/PP nonwoven mat from 5.5 to 56 MPa up to a draw ratio of 11. To decrease the pore size, in the dual-component nonwoven mat, nanoscale poly (methyl methacrylate) (PMMA) colloids were infused into the large pores comprising the void spaces within the nonwoven fabric, thereby effectively reducing the pore size from 10.7 to 0.8 μm. By using the dual-component fiber system, pore size can be reduced by post-processing at a temperature between the melting points of the two different fiber components. Due to that, the efficacy of these nonwoven mats as a physical separator in battery applications was assessed via thermal shutdown analysis.
机译：分层后共挤出纤维状复合材料有助于同步生产双组分纤维。在这项研究中，通过使用多层共挤出对高密度聚乙烯（HDPE）/聚丙烯（PP）/聚苯乙烯（PS）和低密度聚乙烯（LDPE）/ PP / PS复合材料（纤维前体）进行熔融加工。每个复合材料被单轴拉伸以增强HDPE，LDPE和PP纤维状结构域的机械强度。在拉伸过程之后，去除了牺牲PS层，并采用水力缠结，针刺和压缩成型的组合来配制双组分HDPE / PP和LDPE / PP非织造垫。共挤出纤维前体的拉伸将HDPE / PP非织造垫的拉伸强度从5.5提高到56 MPa，拉伸比达到11。为减小孔径，在双组分非织造垫中使用了纳米级聚（甲基丙烯酸甲酯）将（PMMA）胶体注入到包含无纺布内空隙空间的大孔中，从而有效地将孔径从10.7减小至0.8μm。通过使用双组分纤维体系，可以通过在两种不同纤维组分的熔点之间的温度下进行后处理来减小孔径。因此，通过热停机分析评估了这些非织造垫在电池应用中作为物理隔板的功效。

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