Abstract
AbstractThe physical solubilities of terephthalic acid (TPA) in the reaction system oligomeric bishydroxybutyl terephthalates—1,4‐butanediol (BD) are measured using an analytic method from 449 to 507 K. The reaction system is obtained by transesterification of dimethyl terephthalate and excess BD. These results are fitted with the solubility model based on the Margules equation, and the average deviation of the model is 1.20%; the fusion enthalpies ΔHfus of TPA and infinite‐dilution activity coefficients γ∞2 in the system are obtained by regressing of the experimental data. In addition, synthetic method is chosen to determine the total solubility which is complicated by chemical reaction, the results indicate that the chemical reaction start at 452–472 K. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers
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