Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China.
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China.
Sci Total Environ. 2020 May 1;715:137018. doi: 10.1016/j.scitotenv.2020.137018. Epub 2020 Feb 4.
Antibacterial polymer membranes have been widely used in many fields of our daily life. In this study, porous PA6 membrane with ZnO nanoparticles attaching on to the surface of inner pore walls is prepared. Firstly, SMA (styrene maleic anhydride copolymer) is used to graft onto the surface of ZnO nanoparticle in DMF (dimethylformamide). Then the pre-treated ZnO nanoparticles (ZnO-SMA) are added into SEBS (Styrene-ethylene-butylene-styrene copolymer)/PA6 (60/40 wt/wt) blends with co-continuous morphology. The effects of SMA molecular structure (molecular weight and maleic anhydride content) used for ZnO-SMA nanoparticles on their dispersion states in SEBS/PA6/ZnO-SMA nanocomposites are investigated. When SMA3 (MAH = 8 wt%, Mn = 250,000 g mol), which has relatively higher molecular weight and lower MAH content, is used as the pre-treating agent, ZnO-SMA3 nanoparticles tend to be dispersed at the phase interface in SEBS/PA6/ZnO-SMA nanocomposites. However, when SMA2 (MAH = 23 wt%, Mn = 110,000 g mol) with relatively lower molecular weight and higher MAH content is used, no ZnO-SMA2 nanoparticles locate at the interface but stay within PA6 phase. Porous PA6 membranes are obtained by selectively etching SEBS phase out with xylene. It can be found that porous PA6 membrane containing ZnO-SMA3 nanoparticles still exhibits much better antibacterial property (R = 3.76) toward S. aureus even at a very low ZnO content (0.5 wt%). This result should be ascribed to almost all the ZnO-SMA3 nanoparticles being exposed to the surface of inner pore walls of PA6 membrane. This work proposes an effective method to prepare porous polymer membrane with functional nanoparticles selectively located at the inner pore walls.
抗菌聚合物膜在我们日常生活的许多领域都得到了广泛的应用。本研究制备了一种具有纳米 ZnO 粒子附着在内孔壁表面的多孔 PA6 膜。首先，将 SMA（苯乙烯-马来酸酐共聚物）接枝到 DMF（二甲基甲酰胺）中的 ZnO 纳米粒子表面。然后将预处理后的 ZnO 纳米粒子（ZnO-SMA）加入到具有共连续形态的 SEBS（苯乙烯-乙烯-丁烯-苯乙烯共聚物）/PA6（60/40wt/wt）共混物中。研究了用于 ZnO-SMA 纳米粒子的 SMA 分子结构（分子量和马来酸酐含量）对其在 SEBS/PA6/ZnO-SMA 纳米复合材料中的分散状态的影响。当使用分子量相对较高、MAH 含量相对较低的 SMA3（MAH=8wt%，Mn=250000gmol）作为预处理剂时，ZnO-SMA3 纳米粒子倾向于分散在 SEBS/PA6/ZnO-SMA 纳米复合材料的相界面处。然而，当使用分子量相对较低、MAH 含量相对较高的 SMA2（MAH=23wt%，Mn=110000gmol）时，没有 ZnO-SMA2 纳米粒子位于界面处，而是留在 PA6 相中。用二甲苯选择性刻蚀 SEBS 相，得到多孔 PA6 膜。可以发现，即使在 ZnO 含量（0.5wt%）非常低的情况下，含有 ZnO-SMA3 纳米粒子的多孔 PA6 膜对金黄色葡萄球菌仍表现出更好的抗菌性能（R=3.76）。这一结果应归因于几乎所有的 ZnO-SMA3 纳米粒子都暴露在 PA6 膜的内孔壁表面。本工作提出了一种在多孔聚合物膜内孔壁选择性负载功能纳米粒子的有效方法。
