腈纶预氧化丝/芳纶针刺滤材的性能

为获得低成本、高效率空气过滤材料，制备了一种以腈纶预氧化丝为主，并混入不同质量分数芳纶的复合滤材，对其形态、纤维缠结性能、力学性能、透气性、孔径尺寸和过滤性能等进行表征和分析。结果表明：纤维的直线段长度可用来表征滤材纤维缠结程度；添加芳纶，提高了纤维缠结程度和滤材的致密性，提高了滤材断裂强力和 断裂伸长率，减小滤材孔径尺寸；对于粒径≧1.0 μm 和≧2.5 μm 的微粒，芳纶质量分数小于10% 时，复合滤材过滤效率无明显变化，芳纶质量分数大于10%时，复合滤材过滤效率随着芳纶质量分数增大而显著提高。

Properties of pre-oxidized polyacrylonitrile / aramid fiber needled filters

In order to obtain a low cost and high efficiency filter, the composite filters were prepared frompre-oxidized (PAN) fiber mixed witharamid fiber of different weight percentages. The morphology, fiber entanglement, mechanical properties, airpermeability, pore size distribution andfilter efficiency were characterized. The results indicated that the length of straight fiber segmentcan be used to evaluate the degree of fiber entanglement. Adding aramid fiber can enhance fiber entanglement, filter compactness, breaking strength and breaking elongation of the filters, and decreased thepore size. For the particles with diameters above 1.0 μm and 2.5 μm, when the aramid fiber weight percentage is lower than 10%, the filter efficiency of composite filters has no obvious change. However, when the aramid fiber weight percentage is more than 10%, the filter efficiency of composite filters increased significantly with the increase of aramid fiber weight percentage.