Abstract
The dehydration of 3,3',4,4'-benzophenone tetracarboxylic acid (BTA) into its dianhydride (BTDA) has been studied by TG-DSC methods. The influences of reaction conditions on the purity of BTDA are discussed. Using isothermal TG data, kinetic analysis of the dehydration reaction has been made by a sequential procedure. The one-dimensional diffusion model ( X 2 = Kt) is found to be the best for the kinetic equations examined. The kinetic parameters are calculated. The optimal dehydration temperature is in the approximate range 182–211° C. When the dehydration temperature is higher than the melting point of BTDA, it degrades significantly. The extent of degradation chiefly depends on the temperature and scarcely bears any relation to the atmosphere.
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