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The heat capacities of polyalcohol “Plastic Crystals,” such as pentaerythritol [PE, C–(CH 2 OH) 4 ], pentaglycerine [PG, CH 3 –C–(CH 2 OH) 3 ], neopentylglycol [NPG, (CH 3 ) 2 –C–(CH 2 OH) 2 ] and neopentylalcohol [NPA, (CH 3 ) 3 –C–(CH 2 OH)] 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, H 2 NC(CH 2 OH) 3 ] and 2-amino-2-methyl-1,3-propanediol [AMPL, (CH 3 )(NH 2 )–C–(CH 2 OH) 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.

Heat Capacities of “Plastic Crystal” Solid State Thermal Energy Storage Materials