Abstracts Book - IMRC 2018

• SB1-P086
POLYBENZIMIDAZOLES SYNTHESIS IN EATON REAGENT UNDER
DIFFERENT TEMPERATURES AND MICROWAVE IRRADIATION
Jessica Olvera Mancilla 1 , Joaquín Palacios Alquisira 1 , Larissa Alexandrova 2
1 Facultad de Química, UNAM, Fisicoquímica, Mexico. 2 Instituto de Investigaciones en
Materiales, Polímeros, Mexico.
Solution polycondensation of 3,3’-diaminobenzidine with two dicarboxylic acids,
4,4’-oxybis(benzoic acid) and hexafluoroisopropylidene bis(benzoic acid)
reagent to obtain two different polybenzimidazoles, OPBI and CF3PBI
correspondingly, was studied in terms of formation of processable polymers
and insoluble crosslinked gel. The syntheses were conducted in Eaton’s reagent
at 100, 140 and 180 °C using conventional heating and microwave irradiation.
The content of gel fraction was lesser using high temperature relatively to the
soluble polymer. The MW-assisted syntheses resulted in abrupt growth of the
insoluble gel in comparison to the conventional heating. The FTIR data showed
that OPBI suffered more from side acylation reaction than CF3PBI. The MW
irradiation accelerate not only desired condensation but also stimulated the side
acylation reactions.
Acknowledgment:
The authors would like to thank DGAPA for the financial support (projects PAPIIT
# IT101114, IN107117 and grant to Jessica Olvera-Mancilla). The authors thank
to M.A. Canseco (Instituto de Investigaciones en Materiales, UNAM) for the FTIR
data, E. R-Morales (Instituto de Investigaciones en Materiales, UNAM) for the
thermal analyses, S. López Morales (Instituto de Investigaciones en Materiales,
UNAM) for the SEC measurements.
Keywords: Polybenzimidazoles, Crosslinking, Eaton reagent
Presenting authors email: olverajessica@iim.unam.mx