In an article, author is Guo, Zhenghua, once mentioned the application of 5111-65-9, Safety of 2-Bromo-6-methoxynaphthalene, Name is 2-Bromo-6-methoxynaphthalene, molecular formula is C11H9BrO, molecular weight is 237.09, MDL number is MFCD00004062, category is ethers-buliding-blocks. Now introduce a scientific discovery about this category.
Preparation of PVDF membrane based on In-situ Template-TIPS technology and the investigation on membrane formation mechanism, microstructure regulation and permeability
In this work, poly(vinylidene fluoride) (PVDF) flat membrane was prepared via In-situ template-TIPS technology using poly(vinylpyrrolidone) (PVP) as template. The membrane formation mechanism and microstructure evolution of this method were expounded for the first time. The effect of PVP content on the crystallization behavior of the dope, the microstructure, the crystallization behavior and the permeability of the membrane was investigated in detail. Interestingly, the solidification of PVP from the diluent via air-cooling at room temperature not only hindered the PVDF crystallization, but also the growth of PVP led to the formation of porous surface and eliminated the thick and dense skin layer, and thus formed the inter-connected structure and higher porosity (The maximum porosity is 88.9%). The maximum pure water flux reached as high as 3420 L m(-2) h(-1). The membrane also indicated an excellent performance in rejection of bacteria and separation of petroleum ether/ water emulsion (nearly 100%). The alpha crystal phase was formed for the membrane by air-cooling at room temperature. The non-isothermal crystallization kinetics revealed that PVP can act as a heterogeneous nucleating agent for PVDF crystallization and hindered the growth of PVDF crystal in three-dimension. The research presented a novel and simple idea for tailoring the microstructure of membrane via TIPS process.
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