高等学校化学学报2023，Vol.44Issue(12)：34-42,9.DOI:10.7503/cjcu20230311
界面立构复合化电活性聚乳酸纳纤膜的制备及高效过滤性能
Interfacial Stereocomplexation of Electroactive Poly(lactic acid)Nanofibrous Membranes for Efficient Filtration of Airborne PMs
摘要
Abstract
Poly(lactic acid)membrane has great potential in the field of biodegradable air filtration materials,but the low proportion of electroactive phase leads to weak dielectric properties of the membrane,making it difficult to meet the requirements for capturing of high-performance filter materials for airborne particulate matters(PMs).Here-in,the stereocomplex(SC)composed of poly(L-lactic acid)(PLLA)and poly(D-lactic acid)(PDLA)was employed to provide the proportion of high electroactive phase formation,and the stereocomplexed interface of electroactive poly(lactic acid)nanofiber membrane was established by coaxial electrospinning strategy.By adjusting the injection speed during spinning,fiber morphology and the formation of carbonyl(C=O)dipole,β crystal phase and interfa-cial stereocomplex crystals(SCs),the nanofiber membrane of core-shell(CS)structure obtained has improved sur-face potential(9.3 kV)and dielectric constant of 1.60.The mechanical properties of the composite fiber membrane with interfacial stereocomplex were significantly improved.The tensile strength and Young's modulus of core-shell 1.5(CS1.5)nanofiber membrane reached 17.2 MPa and 351.1 MPa,respectively,which were obviously superior to the pure PLLA membrane.More importantly,the enhanced electrical activity significantly enhanced the filtration efficiency of poly(lactic acid)nanofiber membranes for PM0.3 and PM2.5,and the stereocomplexed interface had a unique advantage in dealing with dust collection at high flow rate.The filtration efficiency of CS1.5 nanofiber membrane increased from 82.5 % at 10 L/min to 97.9%at 85 L/min.Furthermore,we developed the strategy of using interfacial stereocomplex to stimulate the electroactivity of poly(lactic acid)for the first time,providing valuable insights for solving the application bottleneck of poly(lactic acid)membrane filtration materials.关键词
聚乳酸/立构复合化/同轴静电纺丝/电活性/空气过滤Key words
Poly(lactic acid)/Stereocomplexation/Coaxial electrospinning/Electroactivity/Air filtration分类
化学化工引用本文复制引用
李小川,唐梦珂,朱金佗,何新建,徐欢..界面立构复合化电活性聚乳酸纳纤膜的制备及高效过滤性能[J].高等学校化学学报,2023,44(12):34-42,9.基金项目
国家自然科学基金(批准号:52003292,52174222,52374236)、江苏省自然科学基金(批准号:BK20200661)和中央高校基本科研业务费专项资金(批准号:2021QN1115)资助.Supported by the National Natural Science Foundation of China(Nos.52003292,52174222 and 52374236),the Natural Science Foundation of Jiangsu Province,China(No.BK20200661)and the Fundamental Research Funds for the Central Universities,China(No.2021QN1115). （批准号:52003292,52174222,52374236）
