仿生水平分支结构聚乙二醇/聚丙烯超细纤维制备及其液体水平扩散性能

为增强熔喷超细纤维材料的液体水平扩散性能，以聚乙二醇（PEG）和聚丙烯（PP）为原料，从仿生角度制备了具有水平分支结构的PEG/PP熔喷超细纤维材料，并对样品中纤维的直径分布、排列形态、上下表面润湿时间，以及水痕扩散面积进行测试。结果表明：不同细度的纤维在水平方向上随机分布，并呈现多根纳米纤维搭接于单根超细纤维的状态，形成仿生分支状网络结构；其中，直径2 000 nm以上的纤维形成一级子分支，800~2 000 nm超细纤维构成二级子分支，800 nm以下的纳米纤维组成三级子分支；三级子分支网络密度可以通过增大PEG比例（0%~20%）和熔体纺丝温度（230~250℃）从1.86到4.20调控；上下表面润湿时间和水痕面积受三级子分支网络密度的影响较大，上表面浸润时间随三级子分支网络密度的增加可从3.234 s降低到2.215 s。

Bionic horizontal branching structure of PEG/PP microfibers material and liquid diffusion properties in horizontal direction

In order to enhance liquid diffusion properties in horizontal direction of the melt blown materials with microfibers. The samples of PEG/PP melt blown microfiber materials were made by the polyethylene glycol (PEG) modified polypropylene (PP) with blend-modification. The fiber fineness distribution, arrangement morphology, the upper and lower wetting time and the moisture welts area tested were tested. The results show that, fibers with different fineness are random distributed in horizontal direction, and multiple nanofibers attach the microfibers, which forming the horizontal branching structure. The fibers above 2000Nm form the primary branches, the microfibers with 800-2000nm consist the second branches, and the nanofibers below 800nm compose the third branches. The network density of the third branches can be adjust from the 1.86 to 4.20 by increasing the ratio of PEG (0%~20%) and melt spinning temperature (230~250 C). The upper and lower wetting time and moisture welts area vary with network density of the third branches, the upper wetting time decreases from 3.234s to 2.215s with network density increase from 1.86 to 4.2.