Abstract：
Here, the poly (l-lactic acid) (PLLA) membrane with multi-structured networks (MSN) is successfully prepared by electrospinning technology for the first time. It is composed of micron-sized ribbon-structured fibers and ultrafine nanofibers with a diameter of tens of nanometers, and they are connected to form the new network structure. Thanks to the special fiber morphology and structure, the interception and electrostatic adsorption ability for against atmospheric particulate matter (PM) are significantly enhanced, and the resistance to airflow is reduced due to the \"slip effect\" caused by ultrafine nanofibers. The PLLA MSN membrane shows excellent filtration performance with ultra-high filtration efficiency (>99.9% for PM2.5 and >99.5% for PM0.3) and ultra-low pressure drop (≈20 Pa). It has demonstrated filtration performance that even exceeds current non-biodegradable polymer materials, laying the foundation for future applications of biodegradable PLLA in the field of air filtration. In addition, this new structure also provides a new idea for optimizing the performance of other polymer materials.
摘要：
这里,首次通过静电纺丝技术成功制备了具有多结构网络（MSN）的聚乳酸（PLLA）膜。它由微米尺寸的带状结构纤维和直径为几十纳米的超细纳米纤维组成，它们相互连接形成新的网络结构。由于特殊的纤维形态和结构，对大气颗粒物(PM)的截留和静电吸附能力显著增强,由于超细纳米纤维引起的“滑移效应”，气流阻力降低。PLLAMSN膜具有出色的过滤性能，具有超高的过滤效率（PM2.5>99.9％，PM0.3>99.5％）和超低的压降（≈20Pa）。它已经证明过滤性能，甚至超过目前的不可生物降解的聚合物材料，可生物降解PLLA在空气过滤领域的应用奠定了基础。此外,这种新结构也为优化其他高分子材料的性能提供了新思路。
