Highly Aligned Centrifugal Spun Polyacrylonitrile Nanofibers Collected and Processed with Automated Tracks
Highly Aligned Centrifugal Spun Polyacrylonitrile Nanofibers Collected and Processed with Automated Tracks
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DOI：
10.1002/mame.202200488
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发表时间：
2022-10
影响因子：
3.9
通讯作者：
Dave Jao;T. A. Lima;Lavenia J Thursch;Matthew D. Flamini;J. Pressly;Jason Ippolito;N. Alvarez;V. Beachley
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文献类型：
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作者：
Dave Jao;T. A. Lima;Lavenia J Thursch;Matthew D. Flamini;J. Pressly;Jason Ippolito;N. Alvarez;V. Beachley
采用平行自动轨道收集器和合理设计的离心纺丝头，对聚丙烯腈（PAN）纳米纤维进行定向收集。离心纺丝是一种极具发展前景的纳米纤维制造技术。然而，连续定向纤维的收集和加工提出了挑战。本研究探讨了这两个挑战的工程解决方案。3D打印头部设计，通过计算流体动力学模拟方法进行优化，用于限制干扰沉积纳米纤维的有害气流。自动跟踪收集装置将沉积的纳米纤维从收集区域拉出。这导致连续供应单个对齐的纳米纤维，而不是致密堆积的纳米纤维网环，沉积在传统的静态后收集器上。自动轨道收集器允许简单地集成拉伸后处理步骤，这对聚合物纤维制造至关重要，可以增强大分子取向和机械性能。经拉伸后的离心纺丝聚丙烯腈纳米纤维的力学性能得到了提高，与传统聚丙烯腈超细纤维相比，聚丙烯腈纳米纤维具有不同的结晶性能。这些技术的发展解决了离心纺丝的关键限制，可以促进高产量的商业制造，高度排列，高性能聚合物纳米纤维。
A parallel automated track collector is integrated with a rationally designed centrifugal spinning head to collect aligned polyacrylonitrile (PAN) nanofibers. Centrifugal spinning is an extremely promising nanofiber fabrication technology due to high production rates. However, continuous oriented fiber collection and processing presents challenges. Engineering solutions to these two challenges are explored in this study. A 3D‐printed head design, optimized through a computational fluid dynamics simulation approach, is utilized to limit unwanted air currents that disturb deposited nanofibers. An automated track collecting device has pulled deposited nanofibers away from the collecting area. This results in a continuous supply of individual aligned nanofibers as opposed to the densely packed nanofiber mesh ring that is deposited on conventional static post collectors. The automated track collector allows for simple integration of the postdraw processing step that is critical to polymer fiber manufacturing for enhancing macromolecular orientation and mechanical properties. Postdrawing has enhanced the mechanical properties of centrifugal spun PAN nanofibers, which have different crystalline properties compared with conventional PAN microfiber. These technological developments address key limitations of centrifugal spinning that can facilitate high production rate commercial fabrication of highly aligned, high‐performance polymer nanofibers.