本文選題：聚砜超濾膜 + 溶液相轉(zhuǎn)化法��； 參考：《浙江大學》2011年碩士論文

【摘要】：本文針對聚合物超濾膜在較高壓力下應用時很容易被壓密的現(xiàn)象,通過調(diào)控鑄膜液性質(zhì),制備系列密度梯度分布海綿狀結(jié)構(gòu)、耐壓性好和通量高的聚砜(PSF)超濾膜。 首先,設計粘度可調(diào)控的PSF/DMAC和PSF/DMAC/PVP共8個不同體系。通過研究鑄膜液的粘度和濁點,相分離過程的光透實驗,膜的表面和斷面形貌,膜孔徑、孔隙率及水通量等,發(fā)現(xiàn)對于由溶液相轉(zhuǎn)化法制備得到的聚砜超濾膜而言,鑄膜液的零切粘度是影響膜形貌、結(jié)構(gòu)與通量的重要因素之一。 其次,設計PSF/DMAC/PVP, PSF/DMAC/Ethanol和PSF/DMAC/Ethanol/PVP共12個不同添加劑含量的體系。通過研究膜的水通量,表面和斷面形貌,耐壓穩(wěn)定性,膜耐壓前后孔隙率的變化等,發(fā)揮PVP和乙醇對鑄膜液的共同調(diào)控作用,得到了密度梯度分布海綿狀結(jié)構(gòu)、耐壓性好和通量高的PSF超濾膜。 最后,通過分散聚合法合成了系列不同單體組成比例的SiO2-PAMPS納米粒子,并以SiO2-PAMPS為添加劑,制備PSF雜化超濾膜。通過考察雜化膜的水通量,孔徑和孔隙率,表面和斷面形貌,力學性能,耐壓穩(wěn)定性及雜化膜振蕩前后的接觸角等,發(fā)現(xiàn)SiO2-PAMPS納米粒子在雜化膜表面非常穩(wěn)定,雜化膜的水通量,力學性能,耐壓性能明顯提高。由PSF/DMAC/Ehanol/SiO2-PAMPS4(單體的摩爾比(MSiO2/MPAMPS)為15.3：1,濃度為0.3 wt%)體系所得的雜化膜,純水通量在0.1 MPa為190 L/m2.h,拉伸強度和斷裂伸長率分別為4.3 MPa和20.5%,斷面結(jié)構(gòu)在0.5 MPa下連續(xù)操作4h,沒有壓密現(xiàn)象發(fā)生。
[Abstract]:In view of the phenomenon that polymer ultrafiltration membrane is easily compacted when it is applied at high pressure, a series of polysulfone (PSF) ultrafiltration membranes with density gradient distribution spongy structure, good pressure resistance and high flux are prepared by regulating the properties of casting solution. First, eight different systems of PSF/DMAC and PSF/DMAC/PVP with adjustable viscosity were designed. By studying the viscosity and cloud point of the casting solution, the photo-transmittance experiment of phase separation process, the surface and cross-section morphology of the membrane, the pore size, porosity and water flux of the membrane, it is found that for the polysulfone ultrafiltration membrane prepared by the solution phase inversion method, The zero shear viscosity of casting solution is one of the important factors affecting the morphology, structure and flux of the membrane. Secondly, 12 systems of PSF / DMAC / PVP, PSF/DMAC/Ethanol and PSF/DMAC/Ethanol/PVP were designed. By studying the water flux, the surface and section morphology, the stability of the membrane and the change of the porosity before and after the membrane compression, the spongy structure of density gradient distribution was obtained by using PVP and ethanol to regulate the casting solution. PSF ultrafiltration membrane with good pressure resistance and high flux. Finally, a series of SiO2-PAMPS nanoparticles with different monomer ratios were synthesized by dispersion polymerization, and PSF hybrid ultrafiltration membrane was prepared with SiO2-PAMPS as additive. By investigating the water flux, pore size and porosity, surface and section morphology, mechanical properties, pressure stability and contact angle of hybrid membrane before and after oscillation, it was found that SiO2-PAMPS nanoparticles were very stable on the surface of hybrid membrane, and the water flux of hybrid membrane was very stable. The mechanical properties and the voltage resistance are obviously improved. The pure water flux of the hybrid membrane obtained from PSF / DMAC / Ehanol / SiO2-PAMPS4 system was 15.3: 1, and the pure water flux was 190Lm2.h. the tensile strength and elongation at break were 4.3 MPa and 20.5wt h, respectively. The cross section structure was operated continuously at 0.5 MPa for 4hs without compaction.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TQ028.8

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