Han Wang,Liang Feng,Jun Zeng,Lingmin Chen,An Chen,Maolin Liu,Jingang Xiong
Nanofiber is a kind of high-performance material, which has great applications. Among many preparation methods, centrifugal electrospinning combines the advantages of electrospinning and centrifugal spinning, with high yield and a wide range of application. But its influencing factors are numerous, the process is still immature, and unable to meet the needs of industrialization. Here, we design a set of centrifugal electrospinning equipment and its process, and explore the influence of rotor form on fiber formation. First, the structure and working principle of experimental equipment of centrifugal electrospinning are introduced. Then, the influence of two factors, the rotor shape and rotor material, on space electric field is studied through theoretical and simulation analysis. Finally, based on the designed equipment, the effects of different rotor forms on the fibers preparation of centrifugal electrospinning are studied. The results show that the fiber diameter of centrifugal electrospinning is greatly affected by the form of the rotor. By changing the surface shape of the rotor and the rotor material, the diameter of the fiber can be controlled. Experiments show that the average fiber diameter of the γ-shaped rotor is the smallest, and the fiber spun with ULTEM PEI 1010 material has the best overall performance.
Zhen-Yuan Wang,Zheng-Jun Fu,Dan-Dan Shao,Mei-Jin Lu,Qian-Cheng Xia,Hui-Fang Xiao,Bao-Wei Su,Shi-Peng Sun
Delamination of the dual-layer membrane fabricated from immiscible polymers is recognized as the main obstacle to advance the technology. The current work discloses an innovative approach to address the delamination issue by incorporating specific functional groups on the polymer chains. Delamination-free P84®/Ultem® dual-layer hollow fiber nanofiltration membranes were obtained by incorporating 4-Fluoro-2-(trifluoromethyl) benzylamine (FTB) in P84® polyimide . The progressively incorporated FTB on P84® decreases solubility parameter difference and establishes specific intermolecular interactions between the polymer pair which contributes to the interpenetration of molecules at the interfacial region of the dual layers. The interpenetrated network structure at the interfacial region renders the robust integrity of the dual-layer membranes. The one-step fabricated membranes had an over 99% rejection of tetracycline (MW: 444.4 Da) in methanol with pure methanol permeance of 3.7 LMH/bar. The elaborated mechanism may potentially enlarge the scope of selecting immiscible polymers for fabricating dual-layer membranes by molecular designing.
危险品化学品经营许可证（带存储）