The platelet adhesion and protein(Fibrinogen and albumin) adsorption ontoamphiphilic polystyrene-graft-poly(ethylene oxide) (PS-g-PEO) and polystyrene-graft -ω-stearyl-poly(ethyleneoxide) (PS-G-SPEO) were investigate...The platelet adhesion and protein(Fibrinogen and albumin) adsorption ontoamphiphilic polystyrene-graft-poly(ethylene oxide) (PS-g-PEO) and polystyrene-graft -ω-stearyl-poly(ethyleneoxide) (PS-G-SPEO) were investigated. It was found that the plateletadhesion on PS-g-SPEO was lower than that on PS-g-PEO. The PS-g-SPEO surface shows apreference for Albumin, while the PS-g-PEO surface absorbed Fibrinogen selectivelyu. Twoeffects of stearyl end group on PS-g-SPEO surface: (1) the lower surface free energe leadsto SPEO enrich at surface; (2) the stearyl end group absorbed albumin selectively, seems tocontribute to resistant the platelet adhesion. So the polymer surface modificed by both stearylgroup and poly(ethylene oxide) chain may be a new ideal way to improve material’s bloodcompatibility.展开更多
Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA...Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA） chain lengths. These copolymers were blended with PVC to fabricate porous membranes via phase inversion process. Membrane morphologies were observed by scanning electron microscopy （SEM）, and chemical composition changes of the membrane surfaces were measured by X-ray photoelectron spectroscopy （XPS）. Static and dynamic protein adsorption experiments were used to evaluate antifouling properties of the blend membranes. It was found that, the blend membranes containing longer PMAA arm length showed lower static protein adsorption, higher water permeation flux and better protein solution flux recovery.展开更多
Amphiphilic copolymer of 5-benzyloxytrimethylene carbonate （BTMC） with poly （vinyl pyrrolidone） （PVP） was successfully synthesized using immobilized porcine pancreas lipase （IPPL） or SnOct2 as catalyst. Hydrox...Amphiphilic copolymer of 5-benzyloxytrimethylene carbonate （BTMC） with poly （vinyl pyrrolidone） （PVP） was successfully synthesized using immobilized porcine pancreas lipase （IPPL） or SnOct2 as catalyst. Hydroxyl terminated PVP, synthesized with 2-mercaptoethanol as a chain transfer reagent, was employed as a rnacroinitiator. The resulting copolymers were characterized by GPC, ^1H NMR and IR. Increasing the BTMC/PVP-OH feed ratio （[B]/[P]） resulted in the increase of Mn of corresponding copolymers and the decrease of Mw/Mn. Immobilized enzyme has comparable catalytic activity to SnOct2 for the copolymerization.展开更多
文摘The platelet adhesion and protein(Fibrinogen and albumin) adsorption ontoamphiphilic polystyrene-graft-poly(ethylene oxide) (PS-g-PEO) and polystyrene-graft -ω-stearyl-poly(ethyleneoxide) (PS-G-SPEO) were investigated. It was found that the plateletadhesion on PS-g-SPEO was lower than that on PS-g-PEO. The PS-g-SPEO surface shows apreference for Albumin, while the PS-g-PEO surface absorbed Fibrinogen selectivelyu. Twoeffects of stearyl end group on PS-g-SPEO surface: (1) the lower surface free energe leadsto SPEO enrich at surface; (2) the stearyl end group absorbed albumin selectively, seems tocontribute to resistant the platelet adhesion. So the polymer surface modificed by both stearylgroup and poly(ethylene oxide) chain may be a new ideal way to improve material’s bloodcompatibility.
基金supported by the National 973 Program(No.2009CB623402)the National Natural Science Foundation of China(No.20974094)
文摘Three well-defined diblock copolymers ofpoly（methyl methacrylate-b-methacrylic acid） （P（MMA-b-MAA）） were synthesized using atom transfer radical polymerization method and varying poly（methacrylic acid） （PMAA） chain lengths. These copolymers were blended with PVC to fabricate porous membranes via phase inversion process. Membrane morphologies were observed by scanning electron microscopy （SEM）, and chemical composition changes of the membrane surfaces were measured by X-ray photoelectron spectroscopy （XPS）. Static and dynamic protein adsorption experiments were used to evaluate antifouling properties of the blend membranes. It was found that, the blend membranes containing longer PMAA arm length showed lower static protein adsorption, higher water permeation flux and better protein solution flux recovery.
基金the financial support of National Key Fundamental Research Program of China （Grant No. G1999064703） the National Natural Science Foundation of China （Grant No. 20104005）.
文摘Amphiphilic copolymer of 5-benzyloxytrimethylene carbonate （BTMC） with poly （vinyl pyrrolidone） （PVP） was successfully synthesized using immobilized porcine pancreas lipase （IPPL） or SnOct2 as catalyst. Hydroxyl terminated PVP, synthesized with 2-mercaptoethanol as a chain transfer reagent, was employed as a rnacroinitiator. The resulting copolymers were characterized by GPC, ^1H NMR and IR. Increasing the BTMC/PVP-OH feed ratio （[B]/[P]） resulted in the increase of Mn of corresponding copolymers and the decrease of Mw/Mn. Immobilized enzyme has comparable catalytic activity to SnOct2 for the copolymerization.
