Liu Xinxin, Jiang Dengbang, Qin Yuyue, Zhang Zhihong, Yuan Mingwei
Green Preparation Technology of Biobased Materials National & Local Joint Engineering Research Center, Yunnan Minzu University, Kunming 650500, China.
Institute of Agriculture and Food Engineering, Kunming University of Science and Technology, Kunming 650550, China.
Polymers (Basel). 2023 Apr 16;15(8):1906. doi: 10.3390/polym15081906.
With the increasing environmental pollution caused by disposable masks, it is crucial to develop new degradable filtration materials for medical masks. ZnO-PLLA/PLLA (L-lactide) copolymers prepared from nano ZnO and L-lactide were used to prepare fiber films for air filtration by electrospinning technology. Structural characterization of ZnO-PLLA by H-NMR, XPS, and XRD demonstrated that ZnO was successfully grafted onto PLLA. An L(4) standard orthogonal array was employed to evaluate the effects of the ZnO-PLLA concentration, ZnO-PLLA/PLLA content, DCM(dichloromethane) to DMF(N,N-dimethylformamide) ratio, and spinning time on the air filtration capacity of ZnO-PLLA/PLLA nanofiber films. It is noteworthy that the introduction of ZnO is important for the enhancement of the quality factor (QF). The optimal group obtained was sample No. 7, where the QF was 0.1403 Pa, the particle filtration efficiency (PFE) was 98.3%, the bacteria filtration efficiency (BFE) was 98.42%, and the airflow resistance (Δp) was 29.2 Pa. Therefore, the as-prepared ZnO-PLLA/PLLA film has potential for the development of degradable masks.
随着一次性口罩造成的环境污染日益严重，开发新型可降解医用口罩过滤材料至关重要。由纳米ZnO和L-丙交酯制备的ZnO-PLLA/PLLA（L-丙交酯）共聚物通过静电纺丝技术用于制备空气过滤纤维膜。通过H-NMR、XPS和XRD对ZnO-PLLA进行结构表征，结果表明ZnO成功接枝到PLLA上。采用L(4)标准正交表评估ZnO-PLLA浓度、ZnO-PLLA/PLLA含量、二氯甲烷（DCM）与N,N-二甲基甲酰胺（DMF）的比例以及纺丝时间对ZnO-PLLA/PLLA纳米纤维膜空气过滤性能的影响。值得注意的是，ZnO的引入对提高品质因数（QF）很重要。得到的最佳组为7号样品，其QF为0.1403 Pa，颗粒过滤效率（PFE）为98.3%，细菌过滤效率（BFE）为98.42%，气流阻力（Δp）为29.2 Pa。因此，所制备的ZnO-PLLA/PLLA膜具有开发可降解口罩的潜力。
