To change the surface property from hydrophobic to hydrophilic and to improve the antifouling property,
the N2-plasma-induced graft polymerization of sugar-containing monomer [α-allyl glucoside (AG) in this
work] was carried out on microporous polypropylene hollow fiber membranes (PPHFMs) for the first time.
The chemical and morphological changes of the membrane surface were confirmed by Fourier transform
infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, pure-water contact-angle, and protein adsorption measurements. It was found that the AG grafting degree increased slightly
with the increase of AG monomer concentration for coating and adsorption on the membrane surface, and
then it decreased when the AG concentration exceeded 0.25 g/mL. The static contact angle of pure water
on the grafted membrane decreased significantly from 120 to 36° with the increase of the AG grafting
degree from 0 to 3.46 wt %, which indicated that the membrane surface was distinctly changed from
hydrophobic to hydrophilic. Most importantly, the contact-angle measurements also revealed that the
hydrophilicity was permanent, and no hydrophobic recovery was observed. The pure-water flux of PPHFMs
grafted with 2.50 wt % AG reached tremendously to 3.82 × 103 kg/(m2·h). Furthermore, modification by
AG grafting made the membrane surface less susceptible to the adsorption of bovine serum albumin. The
modified membranes also give high flux recoveries after cleaning, indicating that the antifouling property
of the membrane was improved.
R-Allyl glucoside (AG) was incorporated into polyacrylonitrile by water-phase precipitation copolymerization (WPPCP) for the first time with K 2S2O8-Na2SO3 as initiator system to improve the resistance properties of protein adsorption and cell adhesion for acrylonitrile-based polymer. The effects of initiator concentration, reaction time and temperature, and total monomer concentration on the copolymerization were studied, and some results were compared with those of solution copolymerization using AIBN as initiator. FT-IR, 1 H NMR, and 13 C NMR spectroscopes, element analysis, and DSC measurement were used to characterize the copolymers. It was found that both the yield and molecular weight for the WPPCP were higher than those for solution polymerization. The AG content in the resulting copolymers and the AG conversion for WPPCP were also higher than those of solution polymerization. The surface properties of the carbohydrate-containing copolymers were studied by pure water contact angle, protein adsorption, and cell adhesion measurements. It was found that the contact angle of the copolymer films decreased from 68°to 30°with the increase of AG content in the copolymer. The adsorption amount of bovine serum albumin (BSA) and the adhesive number of macrophage on the film surface also decreased significantly with increasing R-allyl glucoside content from 0 to 42 wt % in the copolymer. These results revealed that both the hydrophilicity and biocompatibility of polyacrylonitrile-based membranes could be improved by copolymerization acrylonitrile with vinyl carbohydrates.
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