(397e) Reactive Fibrous Materials for the Sorption and Self-Decontamination of Chemical Threats
Modification of surfaces with nucleophilic polymers enables the creation of self-decontaminating materials (SDM), granting them powerful reactive and catalytic properties. We present a series of heterogeneously immobilized copolymers for targeting a variety of chemical threats, especially chemical warfare agents (CWA), and show both chemical characterization and dynamic vapor sorption results.1 Polymers with nucleophilic pyrrolidinopyridine (Pyr) and primary amino (vinylamine, VAm) groups were prepared by free-radical copolymerization of N,N-diallylpyridin-4-amine (DAAP) and N-vinylformamide (NVF), resulting in copolymers of poly(DAAP-co-VAm-co-NVF) which were then immobilized fibers by spray-coating and covalent treatment. Rayon fibers modified by poly(DAAP-co-VAm-co-NVF) were used for the sorption of dimethyl methylphosphonate (DMMP), in the presence of moisture using dynamic vapor sorption technique. These fibers modified with poly(DAAP-co-VAm-co-NVF) were found to facilitate hydrolysis of the sorbed DMMP in the presence of moisture. These were further tested using a CWA simulant diisopropylfluorophosphate (DFP) in aqueous media at pH 8.7, and were shown to facilitate hydrolysis of DFP with an order-of-magnitude faster kinetics. The deposition method and catalytic properties are expected to be of great potential for implementation in various industries, and to provide a novel route for the creation of reactive-sorption materials.
(1) Bromberg, L.; Su, X.; Martis, V.; Zhang, Y. F.; Hatton, T. A. ACS Applied Materials & Interfaces 2016, 8, 17555.