Poly (vinylidene fluoride) (PVDF)/polyethersulfone (PES) hollow-fiber membranes were spun by dry-wet spinning setup. PVDF and PES were employed as base polymers. Four different solvents including dimethyl sulphoxide, dimethyl formamide, 1-methyl-2-pyrrolidone, and dimethyl acetamide (DMAc) were used as the solvents. Polyvinylpyrrolidone (PVP) was used as pore-forming additive. The preparation variables in this work are sort of solvents, content ratio of PVDF/PES, and concentration of PVP. The membranes prepared by phase inversion were characterized by using scanning electron microscopy. Membrane performance was evaluated by shrinkage ratio, pure water flux and retention to bovine serum albumin (BSA). The shrinkage ratio of PVDF/PES blend hollow fiber membrane decreases when DMAc was used as a solvent. The pure water flux of blend membranes reaches the maximum and the retention to BSA reaches the minimum when the casting solution contains 1.5 wt % PES. The pure water flux reaches the maximum when the concentration of PVP is 5 wt %. The retention to BSA decreases and the shrinkage ratio increases with PVP concentration increasing. V C 2010 Wiley Periodicals, Inc. J Appl
A polyvinylidene fluoride (PVDF) membrane was modified by a low temperature plasma treatment and grafted with cross-linked collagen. The crosslinker of collagen was glutaraldehyde. The effects of glutaraldehyde concentration, crosslinking time and crosslinking temperature on membrane properties and surface structure were investigated. The properties of the modified membrane were characterized by the contact angle and pure water flux. The surface structure of the membrane dyed with an acid dye was observed by a polarizing microscope. The modified membrane was further characterized concerning permeability and adsorption capacity. Bovine serum albumin (BSA) was used as a model protein. The cell culture ability of the membrane was examined by the methyl thiazolyl tetrazolium (MTT) method. The amount of grafted collagen on the membrane surface reached the maximum when collagen was cross-linked with 0.4 wt% glutaraldehyde for 1 h at 35 C. The BSA adsorption capacity and cell culture ability examination indicated that the PVDF membrane grafted with cross-linked collagen had good hydrophilicity and biocompatibility.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.