Organosilicon polymers offer several advantages over the traditional polycarbamate (polyurethane) polymers used in commercial coating applications. For example, organosilicons provide enhanced resistance to moisture and are lower in viscosity compared to polyurethane polymers of similar size, in addition to possessing greater resistance to degradation from ultraviolet (UV) radiation in sunlight. Recently, NRL has developed alkoxysilane-terminated N-substituted polyurea polymers that hydrolyze with atmospheric moisture and condense to form inorganic/organic networks. These polymers were formulated as clear and pigmented systems, then applied on substrates to generate highly cross-linked, yet flexible, coatings. The coatings were evaluated by ECBC against toxic chemicals, specifically chemical warfare agents (CWAs), in an effort to assess their interactions and resistivity towards harmful chemicals. Several techniques, such as diffuse reflectance infrared spectroscopy (DRIFTS), reflection absorption infrared spectroscopy (RAIRS), and contact angle (CA), were used to determine the surface interactions, as well as the degree of resistivity. The new polymers have demonstrated a marked decrease in reactivity and increased resistivity compared to the polyurethane polymers used in commercially available chemical agent resistant coatings.

N-Substituted polyurea-silane polymers for coatings with enhanced CWA resistance

256th National Meeting (2018)

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