| PET was a kind of important polymer material which was widelyused because of its perfect properties, such as physical and mechanicalproperity, acidproof alkali, fatigue resistance and dimensional stablility.But the poor permeability, hygroscopicity and resistant oil pollution madePET limited in filter medium applications. PVA had good stability,biocompatibility and biodegrability. In the thesis, electrospinning andglutaraldehyde steam were used for preparation of crosslinked PVA/PETnanofiber membrane. The result showed that the properties of PVA/PETmembrane were improved with good mechanical properties, excellenthydrophilicity and reciclagem, the process was very simple and had alarge production. After the modification, the PET/PVA membrane can beused in filter and membrane separation field.In the thesis, the spinnability of PVA and optimum modifiedconditions were considered at first. Then PET/PVA fiber membrane was produced by electrospinning. With TFA as the solvent, the morphology ofthe PET/PVA membrane was shown by SEM. The result of FTIR andXPS indicated that THA had reacted with PVA.With hexafluoroisopropanol as the solvent, the ideal process weregiven, such as mass ratio of PET/PVA20/1, electrospinning voltage24kV,solution flow rate0.001mm/s, nozzle-target distance15cm.The diametersof fiber distributed in100-300nm and1200-1500nm. FTIR and TGshowed that the properties of the PET/PVA membrane were improved, ithad perfect hydrophily and tensile property.Glutaraldehyde steam was then used to modify the PET/PVAmembrane for10h. The SEM photograph indicated that the morphologyof fiber preserved perfect after modification. The result of DSC/TGindicated PET/PVA composite membrane were crosslinked successfully,and improved the thermal stability. Water contact angle and water fluxtest showed that the crosslinked composite film retained the excellenthydrophilic. Tensile test results showed that the mechanics performanceof composite membrane improved. |
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