Heat Capacities of ‘Plastic Crystal’ Solid-state Thermal Energy Storage Materials

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The heat capacities of polyalcohol “Plastic Crystals,” such as pentaerythritol [PE, C–(CH2OH)4], pentaglycerine [PG, CH3–C–(CH2OH)3], neopentylglycol [NPG, (CH3)2–C–(CH2OH)2] and neopentylalcohol [NPA, (CH3)3–C–(CH2OH)] have been measured over a temperature range encompassing solid-solid and solid-liquid phase changes. Other amine plastic crystals such as tris(hydroxymethyl)-aminomethane [Tris, H2NC(CH2OH)3] and 2-amino-2-methyl-1,3-propanediol [AMPL, (CH3)(NH2)–C–(CH2OH)2] have also been evaluated. The heat capacities of the α phase of the above compounds range between 188 to 294 J/mol K and of the γ phase between 246 and 474 J/mol K. There is a significant increase in the heat capacity when solid-state phase transition occurs, because of orientational disorder. Heat capacity equations for α, γ and liquid phases of these six materials are reported.


Analytical Chemistry | Atomic, Molecular and Optical Physics | Biological and Chemical Physics | Polymer Chemistry


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