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What does PMDA stand for?

PMDA stands for Pyromellitic Dianhydride (chemistry)

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Samples in periodicals archive:

Based on design of experiment (DOE) matrices, the influence of operating conditions on mechanical properties of molded samples were studied systematically for two kinds of m-PETs, namely, n-m-PET and m-m-PET synthesized using pentaerythritol (PENTA) and pyromellitic dianhydride (PMDA) as modifying monomers, respectively.
The [epsilon]' values were comparable with that of H polyimide film--a polyimide based on pyromellitic dianhydride and 4,4'-diaminodiphenylether, which is one of the most common high-performance dielectrics used in microelectronic applications, having a dielectric constant of 3.
The success of pyromellitic dianhydride (PMDA) and 3,3,4,4' benzophenonetetracarboxylic dia-nhydride (BTDA) as epoxy hardening agents is attributed to their tetrafunctionality, which leads to higher density of crosslinks, thus higher heat distortion temperature (HDT) and increased chemical and solvent resistance (17).