Preparation of PVDF/GE hollow fiber membranes with solvent-free method and performance analysis
To solve the problem of organic wastewater discharge in the spinning process of membrane preparation,PVDF/GE hollow fiber membranes were prepared by the solvent-free method.The nascent hollow fiber membranes were prepared by melt spinning PVDF,GE and functional particles.The PVDF crystal structure was redesigned by post-stretching and GE synergistic effect.The effects of different stretching ratios on the crystalline transition,mechanical properties and permeation performance of the hollow fiber membranes were investigated.The surface morphology of the hollow fiber membranes with different stretching ratios was observed,and the pore size distribution,mechanical properties and permeation performance of the membranes were tested by a series of instruments.It was found that the transition from α-crystalline to β-crystalline occurred inside the PVDF/GE hollow fiber membranes.The higher the stretching ratio,the more crystalline transformation was observed inside the membranes.Graphene channels were formed by GE inside the hollow fiber membranes,which improved the mechanical properties and permeation performance of the membranes.When the stretching ratio reached 100％,the tensile strength of the hollow fiber membrane was 37.8MPa,the β-crystalline content inside was 68.64％and the oil flux was 965.64L/(m2·h).
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