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Conventional ''autologous'' fibrin sealants, prepared from fibrinogen concentrates are inconsistent in their physical properties; this reflects the wide variation in the fibrinogen level of the single donor plasma from which they are made. In contrast, the Vivostat ( R) System produces a fibrin sealant of reproducible concentration and mechanical properties that are independent of the source...
Hydrogels were prepared by free radical polymerization in aqueous solution of N-isopropylacrylamide (NIPA) and of NIPA with sodium acrylate (SA) and sodium methacrylate (SMA) as comonomers. For each copolymerization three different compositions were used and for all systems three concentrations of a tetrafunctional crosslinker were employed. Swelling ratios, r = (mass hydrogel/mass dry polymer), were...
Thermal degradation processes in poly(monobenzyl itaconate), poly(mono-2-phenylethyl itaconate) and poly(mono-3-phenyl-1-propyl itaconate), have been studied by DSC, TGA, EGA and FTIR. These analyses have indicated the absence of glass transitions in the three polymers and the occurrence of thermal degradative processes at temperatures of 120°C. This thermal behaviour is confirmed by thermogravimetric...
Polymer-polymer hydrogen-bonded complexes of poly(monomethyl itaconate) with poly(2-vinylpyridine) and poly(4-vinylpyridine) were studied. Several solvents have been assayed for these systems: methanol, methylformamide and binary mixtures (50) of methanol with water, tetrahydrofuran, dimethylformamide and dimethylacetamide. In all cases, instantaneous precipitate formation was observed after mixing...
In this paper the interactions of poly(monoethyl itaconate) with poly(2-vinylpyridine) and poly-(4-vinylpyridine) have been studied. Polymer blends or polycomplexes can be obtained, depending on the solvent employed. The stoichiometry found for the polycomplexes obtained was 2:1 of monoethyl itaconate:pyridine repeat units. Polymer complexes do not show a standard glass transition temperature. ...
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