Some aspects of polybenzimidazoles’ synthesis in Eaton reagent under different temperatures and microwave irradiation
Por:
Olvera-Mancilla, Jessica, Palacios-Alquisira, Joaquin, Escobar-Barrios V.A., Alexandrova, Larissa
Publicada:
1 ene 2019
Resumen:
Solution polycondensations of 3,3'-diaminobenzidine with two dicarboxylic acids, 4,4'-oxybis(benzoic acid) and hexafluoroisopropylidene bis(benzoic acid) to obtain two different polybenzimidazoles, OPBI and CF 3 PBI, correspondingly, were studied in terms of formation of processable polymers and insoluble crosslinked gel. The syntheses were conducted in Eaton’s reagent using conventional heating (CH) at 100, 140 and 180 °C and microwave irradiation (MW) at 90 and 100 °C. The content of gel fraction was lesser using high temperature conditions under CH. The MW-assisted syntheses resulted in acceleration of polycondensations, but an abrupt growth of the insoluble gel was also observed under these conditions. The FTIR data showed that MW irradiation stimulated the side acylation reactions, and OPBI suffered more from the side acylation than CF 3 PBI. © 2019, © 2019 Taylor & Francis Group, LLC.
Filiaciones:
Olvera-Mancilla, Jessica:
Laboratorio de Fisicoquímica Macromolecular, Posgrado Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
Univ Nacl Autonoma Mexico, Posgrad Fac Quim, Lab Fis Quim Macromol, Mexico City, DF, Mexico
Laboratorio de Fisicoquímica Macromolecular, Posgrado Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, México, Mexico
Palacios-Alquisira, Joaquin:
Laboratorio de Fisicoquímica Macromolecular, Posgrado Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
Univ Nacl Autonoma Mexico, Posgrad Fac Quim, Lab Fis Quim Macromol, Mexico City, DF, Mexico
Laboratorio de Fisicoquímica Macromolecular, Posgrado Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, México, Mexico
Escobar-Barrios V.A.:
Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, Mexico
Alexandrova, Larissa:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City, DF, Mexico
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad de México, México, Mexico
Inst Potosino Invest Cient & Tecnol, San Luis Potosi, Mexico
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