Open-celled polymeric foam monoliths prepared by high internal phase emulsion polymerization (HIPE) are being investigated as improved materials for separation of heavy metals. In column flow studies, the foam monoliths have high flow rates and are durable up to at least 40 psi. A 4-vinylpyndine functionality has been incorporated into vinylbenzylchloride/styrene copolymer foams by graft-polymerization of vinylpyridine. The open stmcture of the foam and the flexible graft-polymerized ion-exchange chains result in improved kinetics in metal uptake. Iron uptake kinetics were greatly increased in the grafted foams over resin beads of similar stmcture. Plutonium uplake kinetics were moderately increased in the foams.
Polymeric “smart” coatings have been developed that are capable of both detecting and removing
hazardous nuclear and heavy metal contaminants from contaminated surfaces. These coatings
consist of strippable polymeric compositions containing blends of polymers, copolymers and
additives that can be brushed or sprayed onto a surface as a solution or dispersion in aqueous
media. Upon drying, these coatings form strong films that can easily be peeled or stripped from
the surface. When applied to a contaminated surface, these coatings display responsive behavior.
Areas of contamination are indicated by a color change. As the coatings dry, the contaminants
are drawn into and fixed in the polymer matrix. Subsequent removal of the coating with
entrapped contaminants results in some degree of surface decontamination. Here we report the
development and investigation of a smart, decontaminating coating developed for uranium and
plutonium.
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