This study focuses on using the multilayer melt electrospinning of polymers in combination with a delamination step to obtain nonwoven webs of ribbon-shaped flat fibers that are ~150 to 200 nm thick. A novel coextrusion system with layer multipliers is used to melt electrospin bicomponent cylindrical microfibers with diameters in the range of ~15–25 μm that have up to 257 alternating layers within each fiber prior to delamination. The diameter of the cylindrical fibers is dependent on the temperature, the flow rate of the polymers, and the die tip-to-collector distance. The fabricated bicomponent layered microfibers are subsequently delaminated using sonication or solvent rinsing to obtain flat nanoribbons whose thicknesses vary from 150 to 200 nm. After delamination, some of the flat nanoribbons are found to roll into cylindrical fibers with diameters ranging from 150 to 250 nm. This bicomponent approach uses a continuous melt extrusion process that can support higher throughputs compared to traditional solution electrospinning and can lead to the fabrication of high surface area nonwoven webs after proper delamination treatments. This study focuses on employing multilayer melt electrospinning of polymers coupled with a delamination step to obtain nonwoven webs of ribbon-shaped fibers. A coextrusion technique with layer multipliers was used to melt electrospin cylindrical microfibers that have up to 257 alternating layers within each fiber prior to delamination. The bicomponent layered cylindrical microfibers are delaminated using sonication or solvent rinsing to obtain flat nanoribbon fibers, that are 150 nanometers to 200 nanometers thick.

中文翻译：

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熔体静电纺丝法制备纳米带

这项研究的重点是使用聚合物的多层熔体静电纺丝与分层步骤相结合，以获得约 150 至 200 nm 厚的带状扁平纤维的非织造网。具有层倍增器的新型共挤出系统用于熔化直径在~15-25 μm 范围内的静电纺双组分圆柱形微纤维，在分层之前，每根纤维内具有多达 257 个交替层。圆柱形纤维的直径取决于温度、聚合物的流速和模具尖端到收集器的距离。随后使用超声处理或溶剂冲洗将制造的双组分层状微纤维分层，以获得厚度从 150 到 200 nm 不等的扁平纳米带。分层后，一些扁平纳米带被发现可以卷成直径为 150 到 250 nm 的圆柱形纤维。这种双组分方法使用连续熔体挤出工艺，与传统的溶液静电纺丝相比，可以支持更高的产量，并且可以在适当的分层处理后制造高表面积非织造纤维网。这项研究的重点是采用聚合物的多层熔体静电纺丝与分层步骤相结合，以获得带状纤维的非织造网。使用具有层倍增器的共挤出技术熔化静电纺丝圆柱形微纤维，在分层之前，每根纤维内具有多达 257 个交替层。使用超声处理或溶剂冲洗将双组分层状圆柱形微纤维分层以获得扁平纳米带纤维，