Abstract
The mixing enthalpies of different oligoethers (oligomers of tetrahydrofuran and ethylene oxide and a block cooligomer of these ethers) with hydroxyl and acetyl end groups in various solvents (2-propanol, tri- and tetrachloromethane) are obtained by microcalorimetry. An extended group contribution theory, based on a quasichemical equilibrium between contacting segment surfaces, is applied successfully for the description and prediction of the mixing enthalpies. The theory can be used for every kind of molecular interaction, for polar and non-polar interactions as well as for hydrogen bridges. In addition, it is possible to apply the theory to mixing enthalpies of polymer blends.
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