Vapor deposited thin films have many applications including uses in the semiconductor industry, production of integrated circuits, automotive and optics industries. For diagnostic purposes, thin, optically transparent films provide an excellent venue for interrogating surface interactions between films and substrates.    The present work seeks to investigate the interaction of energetic materials with different substrates using vapor deposited films as a platform. As an example, we have examined the accelerated aging of vapor deposited CL-20 (Hexanitrohexaazaisowurtzitane) on two different substrates.  Similar to any condensed-phase energetic material, the CL-20 aging processes are complex.   Previous studies have investigated thermal and hydrolytic degradation of bulk powders of CL-20, yet data on interfacial interaction effects are limited.    Thin films of CL-20 were deposited on different substrates in order to study the interaction of the film with the substrate as a function of time, temperature, and atmosphere. Films were placed into aging vehicles under three different atmospheres: Air, Nitrogen and Air/Water (nominally 80% RH). Aging vehicles were incubated for 1.5, 3, 6 and 12 months at 85°C, 70°C and 60°C.  Each film was analyzed using ATR/IR Spectroscopy.  Infrared data provided molecular signatures of the degradation products as well as polymorphic changes within the CL-20 films.   Differences in the infrared data were noted as a function of surface and atmospheric exposure and will be presented.

Thin films for characterization of aging using ATR/FTIR spectroscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.