Heat Capacity and Phase Behavior of Selected Oligo(ethylene glycol)s

This work aims to provide reliable heat capacities for ethylene glycol and selected oligo­(ethylene glycol)­s (diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol, and hexaethylene glycol), which are industrially important chemicals produced on a large scale. Besides, new data extend the database needed for a better understanding of complex behavior of compounds capable of forming hydrogen bonds. Isobaric heat capacities of ethylene glycols were measured with a Tian–Calvet-type calorimeter in the temperature range of 260 to 358 K. The phase behavior was investigated with a heat-flux differential scanning calorimeter. A simple additive estimation method for liquid heat capacity of oligo­(ethylene glycol)­s was developed and tested through comparison with newly measured liquid heat capacities of polyethylene glycols 400 and 600