Hydrolysis study of organic acid anhydrides by differential thermal analysis-I Pyromellitic dianhydride.
A technique for following the hydrolysis of pyromellitic acid dianhydride (PMDA) by differential thermal analysis (DTA) is described. On exposure of PMDA to moisture, an endothennic peak is initiated between 190 and 200 degrees . As the degree of hydrolysis increases, this peak becomes more intense and shifts to higher temperatures. The formation of pyromellitic acid (PMA) during the hydrolysis of PMDA can be determined qualitatively by DTA.
Rosenfeld
J M
JM
Insulating Materials Dept. General Electric Company, Schenectady, N.Y., U.S.A.
Loncrini
D F
DF
Murphy
C B
CB