Porous Fibers Templated by Melt Blowing Cocontinuous Immiscible Polymer Blends,ACS Macro Letters

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Porous Fibers Templated by Melt Blowing Cocontinuous Immiscible Polymer Blends
ACS Macro Letters ( IF 5.1 ) Pub Date : 2021-09-20 , DOI: 10.1021/acsmacrolett.1c00456
Aditya Banerji ₁ , Kailong Jin _{1,

2} , Mahesh K Mahanthappa ₁ , Frank S Bates ₁ , Christopher J Ellison ₁

Affiliation

We report a scalable melt blowing method for producing porous nonwoven fibers from model cocontinuous polystyrene/high-density polyethylene polymer blends. While conventional melt compounding of cocontinuous blends typically produces domain sizes ∼1–10 μm, melt blowing these blends into fibers reduces those dimensions up to 35-fold and generates an interpenetrating domain structure. Inclusion of ≤1 wt % of a block copolymer compatibilizer in these blends crucially enables access to smaller domain sizes in the fibers by minimizing thermodynamically-driven blend coarsening inherent to cocontinuous blends. Selective solvent extraction of the sacrificial polymer phase yielded a network of porous channels within the fibers. Fiber surfaces also exhibited pores that percolate into the fiber interior, signifying the continuous and interconnected nature of the final structure. Pore sizes as small as ∼100 nm were obtained, suggesting potential applications of these porous nonwovens that rely on their high surface areas, including various filtration modules.

中文翻译：

熔喷共连续不混溶聚合物共混物模板化多孔纤维

我们报告了一种可扩展的熔喷方法，用于从模型共连续聚苯乙烯/高密度聚乙烯聚合物共混物生产多孔非织造纤维。虽然共连续共混物的常规熔体混炼通常产生约 1-10 μm 的域尺寸，但将这些共混物熔喷成纤维可将这些尺寸减小多达 35 倍，并产生互穿的域结构。在这些共混物中包含≤1 wt% 的嵌段共聚物增容剂，通过最大限度地减少共连续共混物固有的热力学驱动的共混物粗化，至关重要的是能够在纤维中获得更小的域尺寸。牺牲聚合物相的选择性溶剂萃取在纤维内产生了多孔通道网络。纤维表面也表现出渗透到纤维内部的孔隙，表示最终结构的连续性和相互关联性。获得了小至 100 nm 的孔径，表明这些多孔非织造布的潜在应用依赖于它们的高表面积，包括各种过滤模块。

更新日期：2021-10-19

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