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High-Quality Nanofibrous Nonwoven Air Filters: Additive Effect of Water-Jet Nanofibrillated Celluloses on Their Performance
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-06-09 , DOI: 10.1021/acsapm.0c00374 Shaoling Zhang 1 , Akihiko Tanioka 1 , Masayuki Okamoto 2 , Yasuhiro Haraoka 2 , Noriko Hayashi 3 , Hidetoshi Matsumoto 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-06-09 , DOI: 10.1021/acsapm.0c00374 Shaoling Zhang 1 , Akihiko Tanioka 1 , Masayuki Okamoto 2 , Yasuhiro Haraoka 2 , Noriko Hayashi 3 , Hidetoshi Matsumoto 1
Affiliation
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Cellulose nanofibers (CNFs) have been widely used as functional fillers in polymer composites. In the present study, polymer composite nanofibrous nonwoven air filters containing CNFs were prepared, and the additive effect of CNFs on their performance was then investigated. CNFs with an average diameter of approximately 25–37 nm were obtained by water-jet nanofibrillation of pulps from dominant tree species in Japan, Japanese cedar, Japanese white birch, and bamboo. The filters were prepared by coating polymer/CNF composite nanofibers on polyester nonwoven substrates by Zetta spinning from poly(ethersulfone) (PES)/CNF composite solutions. The average diameter of the prepared composite nanofibers ranged from 67 to 89 nm. Aerosol filtration tests clearly indicate that the addition of a small amount of CNFs (∼0.8 wt %) to the PES nanofibers improves the filtration efficiency without reducing the transport properties. The maximum quality factor of PM0.4 at a face velocity of 5.3 cm/s is ∼0.08 Pa–1, verifying the superior quality of the prepared composite nanofibrous filters. Our transmission electron microscopy observation and nitrogen gas and water vapor adsorption experiments suggest that the improvement in filtration efficiency occurs due to the surface functions of the added CNFs. These findings indicate that CNFs are a promising green filler for improving air filtration performance without the chemical modification of polymeric nanofibers.
中文翻译：
高质量纳米纤维非织造空气过滤器：水射流纳米原纤化纤维素对其性能的累加效应
纤维素纳米纤维（CNF）已被广泛用作聚合物复合材料中的功能性填料。在本研究中，制备了包含CNF的聚合物复合纳米纤维非织造空气过滤器，然后研究了CNF对其性能的累加作用。通过对来自日本，日本雪松，日本白桦和竹子的主要树种的果肉进行水射流纳米纤丝化，获得了平均直径约为25-37 nm的CNF。过滤器是通过Zetta纺丝将聚醚砜（PES）/ CNF复合溶液涂覆在聚酯非织造基材上的聚合物/ CNF复合纳米纤维制成的。制备的复合纳米纤维的平均直径为67至89nm。气溶胶过滤试验清楚地表明，添加了少量的CNF（〜0。相对于PES纳米纤维为8wt％）提高了过滤效率，而没有降低传输性能。最大质量因子在5.3 cm / s的表面速度下的0.4约为0.08 Pa –1，这证明了所制备的复合纳米纤维滤嘴的卓越品质。我们的透射电子显微镜观察以及氮气和水蒸气的吸附实验表明，由于添加的CNF的表面功能，过滤效率有所提高。这些发现表明，CNF是一种有希望的绿色填料，可用于改进空气过滤性能而无需对聚合物纳米纤维进行化学修饰。
更新日期：2020-07-10
中文翻译：
高质量纳米纤维非织造空气过滤器：水射流纳米原纤化纤维素对其性能的累加效应
纤维素纳米纤维（CNF）已被广泛用作聚合物复合材料中的功能性填料。在本研究中，制备了包含CNF的聚合物复合纳米纤维非织造空气过滤器，然后研究了CNF对其性能的累加作用。通过对来自日本，日本雪松，日本白桦和竹子的主要树种的果肉进行水射流纳米纤丝化，获得了平均直径约为25-37 nm的CNF。过滤器是通过Zetta纺丝将聚醚砜（PES）/ CNF复合溶液涂覆在聚酯非织造基材上的聚合物/ CNF复合纳米纤维制成的。制备的复合纳米纤维的平均直径为67至89nm。气溶胶过滤试验清楚地表明，添加了少量的CNF（〜0。相对于PES纳米纤维为8wt％）提高了过滤效率，而没有降低传输性能。最大质量因子在5.3 cm / s的表面速度下的0.4约为0.08 Pa –1，这证明了所制备的复合纳米纤维滤嘴的卓越品质。我们的透射电子显微镜观察以及氮气和水蒸气的吸附实验表明，由于添加的CNF的表面功能，过滤效率有所提高。这些发现表明，CNF是一种有希望的绿色填料，可用于改进空气过滤性能而无需对聚合物纳米纤维进行化学修饰。
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