|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Mechanical Properties and Time-dependent Behavior of Vapor-deposited TPD Glass
||Chaiyapat Tangpatjaroen, Diane M Walters, Jaritza Gómez, David Grierson, Mark Ediger, Izabela Szlufarska
|On-Site Speaker (Planned)
Physical Vapor Deposition technique with slow deposition rates and substrate temperatures near the glass transition temperature has been shown to produce molecular glasses with exceptional properties (e.g., higher density, lower enthalpy, and better kinetic stability) as compared to those of ordinary liquid-cooled glasses. However, the mechanical properties of vapor-deposited glasses have yet not been investigated in detail. Here, we investigate the mechanical properties and time-dependent behavior of vapor-deposited N,N′ bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD) thin-film glasses using instrumented nanoindentation. We discover that the elastic modulus and hardness of TPD glass can be controlled by varying the substrate temperature during the thermal evaporation process. We find strong correlations between the reduced elastic modulus and the orientation of the TPD molecules, and between the hardness and the density of the glass. We also find a relationship between the time-dependent deformation behavior and hardness, which plays a key role in determining the stability of these glasses.
||Planned: None Selected