he effect of the pyromellitimide moieties in the increasing of the thermal stability of poly (glycidyl methacrylate). Also the TG scheme shows the temperature of 10% weight loss (T10) and the temperature of 50% weight loss (T50) are at 356˚C and 473˚C respectively.
3.2. Solubility and Viscosity
The polymer shows good solubility in aprotic polar solvents such as NMP, DMAc, DMF, and DMSO, while insoluble with common organic solvents such as tetrahydrofuran, chloroform, acetone and benzene. The polymer had good transparency and its inherent viscosity (η inh) is 0.82 dL/g.
The diacid-diimide was used as a building block of poly(imide-ester) by its reaction with glycidylmethacrylate to produce a new bifunctional monomer. The structure of this monomer was confirmed by FT-IR, 1H FT-NMR, and elemental analysis. The curing reaction of this bifunctional monomer was monitored by DSC scanning which shows that one reaction exotherm represents the crosslinking cured product depending on the reactivity of methacrylic two double bonds with a maximum of the exothermic peak at 180.2˚C. The cured product shows good thermal properties and good solubility in aprotic polar solvents. The crosslinked products can be used as moulding compounds and encapsulating materials in electric or electronic industry.
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