Polyacrylonitrile (PAN) filaments were braided into a braid hollow tube for membrane reinforcement via two-dimensional weaving techniques.Polyacrylonitrile and polyvinylidene fluoride were used as membrane-forming polymers

N

N-dimethylacetamide (DMAc) as solvents and polyvinyl pyrrolidone (PVP) as an additive.PAN filaments braid tube reinforced homogeneous PAN hollow fiber membranes and enhanced heterogeneous polyvinylidene fluoride (PVDF) hollow fiber membranes were prepared by concentric circles squeezing-coating spinning method.Results showed that for the PAN filaments braid tube reinforced hollow fiber membranes the rupture strength was up to 75 MPa or more

and the interface adhesion between reinforcement and separation surface had a good combination in the range of 10% elongation rate.The structure of the separation surface was similar to the structure of asymmetric membranes.The casting solution could penetrate into the gap between fiber bundles of the braided tubes

and did not affect the permeability of the membrane.With polymer concentration increasing

the membrane flux was decreased

and the retention rate of BSA was increased.With additive PVP concentration increasing

the membrane water flux was increased and then decreased

in addition

maximum was at 8%; but the retention rate of BSA was increased monotonically.The results also showed that the interface adhesion of the filaments braid tube reinforced homogeneous hollow fiber membranes were better than that of the heterogeneous ones.