Iodinated polyurethane

Our group recently reported iodinated polyurethane (IPU) sponges. The IPU sponges were coated with ethylene vinyl acetate (EVA), to release iodine in a controlled rate for water decontamination combined with active carbon cartridge, which adsorbs the iodine residues after the microbial inactivation. Controlled and stable iodine release was observed with the EVA-coated IPU sponges and was effective in deactivating the bacteria and virus present in the contaminated water (Figure 8.12). Thus, these iodinated... 

Use Catalyst for polyurethane foams, oxidation and polymerization catalyst, chemical intermediate (metal complexes, quaternary ammonium compounds, etc.), bromine and iodine addition compounds. 

Isocyanate Content Isocyanate levels in polyurethane preparations were measured on 2g samples taken from the polym-erizate and immediately cut into small pieces which were then promptly immersed in excess 0.05 N di(n-butyl)amine solution in dry tetrahyrofuran which was contained in an iodine flask. The gross weight of reagent plus flask was very accurately determined ahead of time to enable the exact weight of the added polyurethane sample to be subsequently determined by difference. Excess di(n-butyl)amine was titrated with 0.05N hydrochloric acid to the bromcresol green endpoint to enable calculation of the sample isocyanate concentration. 

The adsorption of gaseous iodine species on surfaces has received much attention in the reactor safety literature. Varieties of metal, concrete and painted surfaces are in a reactor containment building. The gaseous forms of iodine will interact with these surfaces. The interactions are usually thought to involve a rapid physical adsorption followed by a slower chemical reaction. Dry (or moist, but not wet) surfaces of both stainless steel and organic (vinyl-, epoxy-, polyurethane-) paint have large capacities for absorbing molecular iodine. The adsorption rate of molecular iodine on the dry surfaces is close to the limit dictated by gas-phase mass transport. Intermediate-scale studies performed in the Radioiodine Test Facility have shown that about 75 to 95% of airborne molecular... 

Brash studied Fg and antithrombin radiolabeled using and respectively, so that adsorption of both proteins could be measured in the mixture. After functionalization with ATH, the polyurethane surface (PEO-OH-ATH and PEO-COOH-ATH) preferentially binds with antithrombin rather than Eg, suggesting the strong heparin surface binding activity (Eigure 2.25). By labeling both Eg and antithrombin with different iodine isotopes, the authors obtained competitive adsorption information on the same heparin-modified surface. 

O. Aviv, N. Laout, S. Ratner, O. Harik, K.R. Kundura, A.J. Domb, Controlled iodine release from polyurethane sponges for water decontamination, J. Controlled Release 172 (2013) 634-640. 

Additives used in final products Fillers barium and strontium ferrites, boron carbide, calcinated clays, calcium carbonate, carbon black, carbon-silica dual phase filler, clays, dolomite, fumed silica, iron oxide, magnesium aluminum silicate, magnesium carbonate, mica, montmorillonite, nickel zinc ferrite, nylon fibers, pulverized polyurethane foam, quartz, silica carbide, soapstone, talc, zinc oxide Plasticizers naphthenic oil, polybutene, aromatic oil, esters of dicarboxylic acid Plasticizers adipates, aromatic mineral oil, paraffin oil, phosphates, phthalates, polyethylene glycol, processing oil, sebacates Antistatics dIhydrogen phosphate of 8-amlnocaprolc add. Iodine doping Antistatics carbon black, quaternary ammonium salt, zinc oxide whisker Antiblocking diatomaceous earth Release propylene wax Slip erucamide+stearamide ... 

Intermolecular-intramolecular copolymerization MA-diallyl ether, 314, 325, 348 MA-dienes, 348, 358 MA-divinyl silanes, 327, 385 Interpenetrating polymer networks, polyester-polyurethane blends, 490 Iodine, 198... 

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