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选择不同黏度的聚乙烯醇羧丁醛(PVB)树脂,分别添加到聚氨酯(PU)/SiO2体系中,利用浸没沉淀相转化法制备了PU/PVB/SiO2共混杂化膜。分别对PU共混杂化体系的DMA曲线、膜性能进行了测试,并用SEM观察了膜试样的断面结构。结果表明:PVB与PU共混后,该体系的耐非溶剂性变强;PU/PVB为基本不相容体系,但加入PVB能明显加快体系的分相速度,促使在PU/PVB之间产生界面微孔;SEM膜断面照片也显示了分相速度加快而成型出较大的指状孔。PU共混杂化膜的水通量和截留率明显提高,在保持较高通量情形下,截留率可高达85%。
Polyvinyl butyral (PVB) resins with different viscosities were selected and added to PU / SiO2 system respectively. PU / PVB / SiO2 blends were prepared by immersion-precipitation phase inversion method. The DMA curves and membrane properties of the PU hybrid system were respectively tested. The cross-sectional structure of the membrane samples was observed by SEM. The results show that the non-solvent resistance of the system becomes stronger after blending with PVB and PU / PVB is the basic incompatible system, but the addition of PVB can obviously accelerate the phase separation velocity of the system and promote the production of PU / PVB The interface micropore; the SEM film section photograph also shows that the phase separation speed is accelerated and the larger finger hole is formed. The water flux and rejection of PU hybrid membranes were significantly increased, with a high rejection of up to 85%.