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Curable Imidazolium Poly(ionic liquid)/Ionic Liquid Coating for Containment and Decontamination of Toxic Industrial Chemical-Contacted Substrates

Martin, Rhia M., Mori, Dylan I., Noble, Richard D., Gin, Douglas L.
Industrial & Engineering Chemistry Research 2016 v.55 no.22 pp. 6547-6550
DCB (herbicide), ambient temperature, coatings, crosslinking, decontamination, engineering, ionic liquids, liquids, mechanical properties, polychlorinated biphenyls, polymerization, rubber, sorption, steel, toxicity, vapors
A curable, imidazolium-based room-temperature ionic liquid (RTIL) coating system has been developed for the containment and decontamination of toxic industrial chemical-contacted surfaces. The curing times and mechanical properties of this poly(RTIL)/RTIL platform, which is based on alcohol–isocyanate step-growth polymerization chemistry, can be tuned by modifying the structures of the step-growth monomers, the stoichiometric ratio of linear (diol, A₂) to cross-linking (triol, A₃) RTIL monomers used, and the amount of free RTIL in the formulation. When applied to painted steel and rubber test substrates contacted with o-dichlorobenzene (o-DCB) (a polychlorinated biphenyl simulant), a 50:50 (A₂:A₃) step-growth alcohol-RTIL monomer mixture cross-linked with a stoichiometric amount of a commercial di-isocyanate monomer (B₂) and containing 43 wt % free RTIL in the coating, reduced the o-DCB vapor amount by 96–99% compared to the uncoated, o-DCB-contacted control samples. This peelable, flexible, solid coating also removed by sorption up to >99% of the o-DCB liquid applied to the substrates after 24 h of contact.