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Abstract
Polyoxymethylene dimethyl ethers (OMEx) are frequently considered as a promising alternative to diesel fuel. However, for the development of the respective technology, a sound knowledge about their thermophysical properties is required. Isobaric heat capacity measurements of five OMEx with a chain length x = 1 to 5 are conducted under ambient pressure in the temperature range from about 248 K to 390 K. These are: 2,4-Dioxapentane (OME1), 2,4,6-Trioxaheptane (OME2), 2,4,6,8-Tetraoxanonane (OME3), 2,4,6,8,10-Pentaoxaundecane (OME4) and 2,4,6,8,10,12-Hexaoxatridecane (OME5). To validate the employed apparatus and measurement procedure, water, methanol and ethanol are sampled as well. The measurements are carried out with a differential scanning calorimeter μDSC by Setaram with an overall relative expanded (k=2) uncertainty Ur(cp) of ±1 %. Polynomial equations in terms of temperature are fitted to the measured data. An extensive comparison to literature data is made.
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