Abstract:We have established a comprehensive approach to evaluate the structure−property relationships in solid pyromellitic dianhydride (PMDA) at high temperature. Synchrotron singlecrystal X-ray diffraction experiments have yielded structural models for this volatile compound up to 250 °C. PMDA exhibits negative thermal expansion around 145 °C, which is correlated to geometrical changes in the intermolecular carbonyl−carbonyl interactions. A reversible phase transition above ca. 210 °C was detected by differential sc… Show more
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