A continuous method without any solvent is proposed to produce porous hollow fibers for membrane (HFM) applications. In this case, linear low-density polyethylene was combined with azodicarbonamide to produce samples via extrusion. In particular, the processing (chemical blowing agent content and temperature profile) and post-processing (stretching velocity) conditions were optimized to obtain a cellular structure having a high cell density and uniform cell size distribution. From the samples obtained, a complete set of characterization was performed (morphological, mechanical, physical, and gas transport). The results show that HFM having a higher cell density can increase gas permeability, especially for hydrogen. Overall, it is shown that low-cost polyolefins having a suitable cellular structure can be used for gas separation membranes.

中文翻译：

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加工条件对膜用聚乙烯中空纤维泡沫泡孔形态的影响

提出了一种没有任何溶剂的连续方法来生产用于膜 (HFM) 应用的多孔中空纤维。在这种情况下，线性低密度聚乙烯与偶氮二甲酰胺结合以通过挤出生产样品。特别是，优化了加工（化学发泡剂含量和温度分布）和后加工（拉伸速度）条件，以获得具有高泡孔密度和均匀泡孔尺寸分布的泡孔结构。从获得的样品中，进行了一套完整的表征（形态、机械、物理和气体传输）。结果表明，具有更高单元密度的 HFM 可以增加气体渗透性，尤其是对于氢气。总之，表明具有合适多孔结构的低成本聚烯烃可用于气体分离膜。