冷冻-相转化复合法制备高性能PVDF膜
首发时间:2010-12-30
摘要:选用醋酸纤维素(CA)为添加剂,采用冷冻-相转化复合法制备高机械强度的抗污染聚偏氟乙烯(PVDF)微滤膜。主要基于冷冻一定时间后,铸膜液发生不完全的固-液相分离,之后进行相转化成膜,促使膜主体中亲水性的CA链段发生表面偏析,提高膜表面的亲水性,同时抗污染能力得到增强。冷冻过程提高了膜的机械强度,而相转化过程使CA在膜表面富集,保证了膜表面的亲水性。电镜照片显示冷冻-相转化复合法制备的膜无明显孔道,机械性能的测定表明复合法制备的膜具有较高的机械强度,X射线光电子能谱数据显示膜表面的亲水性基团含量高于膜主体。以蛋白质、酵母菌溶液为模拟溶液,微滤膜分离实验研究证明冷冻-相转化方法制备的PVDF具有优良的抗污染性能和化学稳定性。
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Preparation of PVDF membranes by freeze-phase invension combined method
Abstract:The poly(vinylidene fluoride) (PVDF) microporous membranes with high mechanical strength and antifouling property were fabricated by by freeze-phase inversion composition method using cellulose acetate (CA) as a additive. At a short freeze time, there was no complete solid-liquid phase separation befor phase inversion in water bath; so that more CA segments were segregated to membrane surface and enhance hydrophilic property and antifouling ability.The photos of scanning electron microscopy (SEM) shown no observed channels across the membrane. The mechanical properties test proved the fabricated PVDF microporous membranes had high mechanical strength. X-ray photoelectron spectroscopy (XPS) analysis confirmed that the surface content of CA in the membrane surface is higher than that in the membrane matrix. PVDF micriporous membranes have excellent antifouling property during protein and yeast separation process.
Keywords: PVDFmicroporous membrane freeze-phase inversion antifouling ability
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