About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Order-Disorder Phase Transformations in Polyalcohols and Amine Plastic Crystals |
Author(s) |
Amrita M. Gautam |
On-Site Speaker (Planned) |
Amrita M. Gautam |
Abstract Scope |
Organic Plastic crystals such as Pentaerythritol, Neopentyl glycol, etc. undergo a reversible phase transition from a low-temperature layered structure to a high-temperature orientationally disordered phase. The O–H…O or O–H…N intermolecular bonds are rigid in the low-temperature structures, but in the high-temperature structures, these bonds rotate around the C–C bond in the tetrahedral globular molecules storing large amounts of thermal energy. This makes them candidates for thermal energy storage. Small amounts of pressure can also induce phase transitions near room temperatures with large changes in entropy, which makes Neopentyl glycol a non-toxic alternative for refrigeration applications. The CALPHAD method was used to predict the phase equilibria of select amines/polyols along with high-temperature XRD, DSC, and Raman Spectroscopy. The results of these studies will allow us to better understand the role of rotational symmetry on complex phase transition mechanisms and provide more latitude for adjustment of phase transition temperatures. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Phase Transformations, Energy Conversion and Storage |