期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 40, 期 1, 页码 171-178出版社
WILEY
DOI: 10.1002/pola.10098
关键词
bisphenol A; diphenyl carbonate; equilibrium constant; polycarbonates; thermodynamics; step growth polymerizations
Despite the industrial significance of poly(bisphenol A carbonate), there is a scarcity of open literature on the equilibrium of the melt-phase process. In fact, the equilibrium constant (K-eq) for this reaction has never been measured directly. This article describes a process on the basis of NMR for the measurement of K-eq for the reaction between bisphenol A and diphenyl carbonate in the presence and absence of a catalyst. The apparent enthalpy and entropy were calculated using a van't Hoff plot. Decomposition of bisphenol A is a common side reaction in the melt-phase reaction performed at high temperatures in the presence of catalyst. The effect of these side reactions on the K-eq in the presence of catalyst is determined. (C) 2001 John Wiley & Sons, Inc.
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