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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).
polyamic acid (PAA) having molecular weight 42,000 a condensation product of pyromellitic dianhydride and oxydianiline (ODA).
[20, 21] mentioned molar complexes between the studied solvent, 1-methyl-2-pyrrolidinone (NMP) and pyromellitic dianhydride dianiline poly(amic acid)s where four molecules of NMP hydrogen bond to the repeat unit of the precursor creating populations of bound and free species of NMP.
 using pyromellitic dianhydride (PMDA) as a tetrafunctional chain extender.
We have reported two new [pi]-conjugated diamines, 5,5'-bis(4-arninophenyl)-2,2'-bifuryl (PFDA) and 2,2'-bis(furyl)benzidine (FurylBZ), and their polyimides (PIs), prepared from pyromellitic dianhydride (PMDA) (14, 15).
Polyanhydrides, particularly pyromellitic dianhydride (PMDA) (24, 25), and polyepoxides (26-28) have been widely used for chain extension and branching of PET, allowing a significant increase in molecular weight, intrinsic viscosity, and melt viscosity.