116 Microwave Assisted Polycondensation of Polyimides by [4,4x-(Hexafluoroisopropylidene)Diphthalic Anhydride, Pyromellitic Dianhydride] and [2, 4, 6-Trimethyl-m-Phenylenediamine]. Power, Time and Solvent Effect

Wednesday, November 4, 2009: 9:40 AM
Rio Grande (Camino Real Hotel)
Hugo T. Mendoza , Facultad de Química, Universidad Nacional Autónoma de México., México, Mexico
Joaquin A. Palacios Sr., Ph D , Facultad de Química, Universidad Nacional Autónoma de México., México, Mexico
The microwave assisted polycondensation of two polyimides were studied using pyromellitic dianhydride (PMDA), and 4,4´-(hexafluoroisopropyliden)diphthalic anhydride (6FDA) as dianhydride monomers and 2,4,6-trimethyl-m-phenylenediamine (TrmPD), as diamine monomer, under microwave irradiation in DMF and DMSO solvents. The structure and performance of polymers were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Viscosity, Density, and Thermogravimetric Analysis (TGA). The results show that the polyimides can be obtained in a short reaction time with high intrinsic viscosity and high yield. The effect of the presence of a bridging group, -C(CF3)2-,  in the monomer structure is apparent in the permeability parameters of the macromolecules since polymer (6FDA-TrmPD) always presents better results than polymer (PMDA-TrmPD). Properties as density and Tg increases with the time exposition to the microwave irradiation. Polyimides obtained presents good thermal properties because they began to lose weight in a range of 9 to 16 percent at high temperature as 500 °C.  
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