The thermal pressure coefficients and densities of six plasticizers for dimthyl phthalate

diethyl malonate

triethyl phosphate

tributyl phosphate

dibutyl oxalate

dibutyl sebacate have been measured over the temperature range of 25-85℃.The augmented van der Waals model is used to correlate the experimental data.A method of predicting the internal pressure of the plasticizers is established

and the new solubility parameters for thirty plasticizers are obtained.