PPF膜接枝离子液体及其水解性能的研究

In this paper, polypropylene fibrous (PPF) membranes were treated by long-distance and dynamic low-temperature plasma (LDDLTP) flow and grafted with 1-vinylimidazole acidic ionic liquids (ILs) through free radical polymerization. Then the prepared ILs-g-PPF membranes were used for the hydrolysis of inulin polysaccharides. The effects of ILs concentration and reaction temperature on ILs grafting degree were investigated. On the basis the effects of ILs grafting degree and membrane flux on hydrolysis of inulin polysaccharides were studied, too. Furthermore, The PPF membranes were characterized by Fourier transform infrared spectroscopy (FTIR), x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and contact angle measuring instrument. As a result, it showed that the ILs were grafted into PPF membranes stability. When ILs concentration, graft temperature and membrane flux were 5.0%, 60℃ and 1.5 mL/min, respectively, the hydrolysis performance of ILs-g-PPF membrane was the best. Meanwhile, to verify the catalytic performance stability of the ILs-g-PPF membrane prepared under the optimal conditions, it was used for hydrolysis of the same inulin polysaccharides and can achieve the hydrolysis ratio of 99.8% eventually.