高介电纳米异质结诱导立构复合化聚乳酸纳纤膜制备及其PM_(0.3)过滤性能研究  

Preparation and PM_(0.3) Filtration Performance of Stereocomplexed Poly(lactic acid)Nanofibers Induced by High-dielectric Hetereostructures

作　　者：李庭斌 李欣雨 朱桂英 王存民 江亮 邵将 张明明[5] 徐欢 Ting-bin Li;Xin-yu Li;Gui-ying Zhu;Cun-min Wang;Liang Jiang;Jiang Shao;Ming-ming Zhang;Huan Xu(China Energy Shendong Coal Group Co.,Ltd.,Yulin 719315;School of Safety Engineering,University of Mining and Technology,Xuzhou 221116;School of Materials Science and Physics,University of Mining and Technology,Xuzhou 221116;School of Architecture and Design,University of Mining and Technology,Xuzhou 221116;China Academy of Safety Science and Technology,Beijing 100012)

机构地区：[1]国能神东煤炭集团有限责任公司,榆林719315 [2]中国矿业大学安全工程学院,徐州221116 [3]中国矿业大学材料与物理学院,徐州221116 [4]中国矿业大学建筑与设计学院,徐州221116 [5]中国安全生产科学研究院,北京100012

出　　处：《高分子学报》2025年第3期476-486,共11页Acta Polymerica Sinica

基　　金：国家能源集团井工煤矿粉尘与职业病防治研究(六)煤矿粉尘防护装备研发项目(项目号E210100285);中国矿业大学研究生创新计划项目(项目号2024WLKXJ140,2024WLJCRCZL276,2024WLKXJ143,2024WLJCRCZL272,2024WLJCRCZL195);中央高校基本科研业务费专项资金(基金号2024-10967,2024-10958)资助。

摘　　要：开发高性能空气过滤材料对于保护人体生命健康十分重要.本研究通过静电诱导立构复合化策略使聚L-乳酸(PLLA)和聚D-乳酸(PDLA)链间发生相互作用,触发氢键的产生,促进C=O偶极子取向,诱导立构复合化聚乳酸(PLA)的形成,然后利用银掺杂二氧化钛(Ag-TIO)纳米电介质促进分子相互作用以进一步增强PLA的立构复合,制备具有高电活性的纳米纤维膜实现高效低阻的空气过滤.结果表明,Ag-TIO纳米电介质与静电诱导立构复合化策略协同提升PLA纳米纤维膜的电活性、过滤性能和力学性能:纤维显著细化(从467 nm到162 nm),表面电势大幅提升(从0.15 k V到3.20 k V),对PM_(0.3)具有优异的过滤效率同时保持超低压降(93.3%,32 Pa,32 L/min),抗拉强度和断裂伸长率分别为11.9 MPa和24.0%,杨氏模量和断裂韧性高达202.6 MPa和2.48 MJ/m^(3),具有良好的实际应用性.本研究所提出的可降解纳米纤维膜在超细颗粒物的高效过滤中具有广阔应用前景.The development of high-performance air filtration materials is important for protecting human life and health.In this study,the interaction between poly(L-lactic acid)(PLLA)and poly(D-lactic acid)(PDLA)chains was induced by the electro-induced stereocomplexation strategy,which triggered the generation of hydrogen bonding,promoted the orientation of the C=O dipole,and induced the formation of stereocomplexed poly(lactic acid)(PLA).Then,silver-doped titanium dioxide(Ag-TIO)nanodielectrics were used to promote molecular interactions to further enhance the stereocomplexation of PLA,and nanofiber membranes with high electroactivity were prepared to achieve high-efficiency and low-resistance air filtration.The results showed that Ag-TIO nanodielectrics and electro-induced stereocomplexation strategy synergistically enhanced the electroactivity,the filtration performance and the mechanical properties of PLA nanofiber membranes:the fibers were significantly refined(from 467 nm to 162 nm),and the surface potentials were dramatically increased(from 0.15 kV to 3.20 kV),which resulted in an excellent filtration efficiency against PM_(0.3) while maintaining an ultra-low pressure drop(93.3%,32 Pa,32 L/min).Moreover,the mechanical properties of the membranes were excellent with tensile strength and elongation at break of 11.9 MPa and 24.0%,respectively,while Young’s modulus and fracture toughness were as high as 202.6 MPa and 2.48 MJ/m^(3),which showed good practical applicability.The proposed biodegradable nanofibrous membranes have a broad application prospect in the efficient filtration of ultrafine particles.

关 键 词：聚乳酸 可降解纤维 立构复合化 电活性 空气过滤 

分 类 号：TQ051.893[化学工程]