According to the hypothesis of "Maintaining normal configuration", the polymers with the structure of sulfo-ammonium inner salt would be nonthrombogenic. In this paper, a series of polymers of 3-N,N-dimethyl...
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According to the hypothesis of "Maintaining normal configuration", the polymers with the structure of sulfo-ammonium inner salt would be nonthrombogenic. In this paper, a series of polymers of 3-N,N-dimethyl-3-N-methacryloyloxyethyl ammonium propanesulfonate(DMAPS) and its copolymers with polyethyleneglycol monomethylether methacrylate were prepared by using different concentrations of monomers and crosslinking agent. Their blood compatibilities were evaluated by platelet adhesion method. The results show that PDMAPS is of excellent platelet adhesion resistance.
Biocompatibility,particularly blood compatibility is the most important property required for biomedical *** improvement of blood compatibility is always an important research task for biomaterial research and *** is ...
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Biocompatibility,particularly blood compatibility is the most important property required for biomedical *** improvement of blood compatibility is always an important research task for biomaterial research and *** is an important way to develop biomaterials by constructing special molecules onto the proper mechanical material *** are widely used as biomaterials due to their good biocompatibility and mechanical ***,their blood compatibility is still not adequate for the more demanding *** purpose of present study was to synthesis a novel nonthrombogenic biomaterial by modifying the surface of *** was used to introduce active peroxide groups onto polyetherurethane surface and graft polymerization of N,N dimethyl N methacryloxyethyl N (3 sulfopropyl) ammonium (DMMSA), a sulfobetaine structure,onto the ozone activated polyetherurethane surface was *** nonthrombogenic properties of grafted film were also *** grafted film was characterized by ATR FTIR,XPS and contact angle *** ATR FTIR,XPS of the grafted PU film indicated that the graft polymerization did take place,the grafted PU film surface was covered with the DMMSA *** grafting yields in different condition were *** grafting yields increased with the increase of the monomer *** absorption and contact angle showed that the hydrophilicity of the film had been improved greatly,and the hydrophilicity of the film increased with the grafting *** blood compatibility of the grafted films was evaluated by platelet adhesion in platelet rich plasma and scanning electron microscopy observation using PU film as the *** platelet adhesion was observed for the grafted films incubated for 60 min and 180 min,however,the ungrafted PU film was covered with *** result of platelet adhesion experiment indicated that the PDMMSA chains could prevent platelet adh
Nanocomposites based on ethylene vinyl acetate (EVA) and montmorillonite (MMT) were prepared using melt mixing of the two components and an intercalation agent hexadecyl trimethyl ammonium bromide(CTAB).The struc ture...
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Nanocomposites based on ethylene vinyl acetate (EVA) and montmorillonite (MMT) were prepared using melt mixing of the two components and an intercalation agent hexadecyl trimethyl ammonium bromide(CTAB).The struc ture and properties of EVA/clay nanoco mposites were characterized by XRD,TGA,Molau and mechanical properties *** results showed that EVA could be intercalated into the galleries of layered sil icates in these samples,and the distance between layers of MMT in the EVA matrix was 4.09 *** adhesion between the components in the EVA/MMT (95/5) nan ocomposites was improved because the contact area between MMT layers and EVA mat rix increased and there was a great deal of active sites on the surface of MMT l ayers,which could bind tightly with the EVA *** with those of EVA/MM T (95/5) composites without CTAB,the tensile strength,the Young’modulus and the tear strength of EVA/MMT (95/5) nanocomposites prepared in this work increased b y about 20 2%,43 3% and 17 1%,*** thermal behavior of the compos ites was examined on a thermobalance in *** the EVA/MMT (95/5) nanocomp osites,the acceleration of EVA deacylation and the deceleration of thermal degra dation were observed.
In order to construct the zwitterionic structure of phosphorylcholine onto the surface of biomaterials, five novel phospholanes containing hydroxyl group were synthesized from the corresponding diol and 2-chloro-2-oxo...
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In order to construct the zwitterionic structure of phosphorylcholine onto the surface of biomaterials, five novel phospholanes containing hydroxyl group were synthesized from the corresponding diol and 2-chloro-2-oxo-1,3,2-dioxaphospholane in the presence of THF. Then, five novel phosphorylcholines containing hydroxyl group were prepared by the corresponding phospholane and anhydrous trimethylamine in the presence of acetonitrile. Their structures were characterized by FTIR, 1H NMR and elemental analysis.
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