Blended polybenzimidazole and melamine-co-formaldehyde thermosets

Klaehn, John R.; Orme, Christopher J.; Peterson, Eric S.

doi:10.1016/j.memsci.2016.05.016

Blended polybenzimidazole and melamine-co-formaldehyde thermosets

Journal Article · Wed May 11 00:00:00 EDT 2016 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2016.05.016· OSTI ID:1357450

Klaehn, John R. ^[1]; Orme, Christopher J. ^[1]; Peterson, Eric S. ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)

Polybenzimidazole [PBI; poly-2,2’(m-phenylene)-5,5’-bibenzimidazole] is known to have excellent high temperature stability (up to 450 ºC) and superb H₂/CO₂ selectivity compared to most high performance (HP) polymers. But, PBI has issues in thin-film formation compared to other HP polymers, due to challenging processing techniques. In this work, new blended thermosets were made with PBI and poly(melamine co-formaldehyde) [PMF] to produce stable thin-films after thermal processing at 220-250 ºC. PBI film formation is difficult, and the film tends to fracture and fissure due to loss of processing aids and stabilizers (salt/acid additives) that are found in PBI solutions above10 wt %. The PBI-PMF blended thermosets we report do not have stabilizers, and can be made into dense thin-films. It is remarkable that these thermally processed PBI-PMF films were stable in deionized water for extended periods, whereas many PBI films that contain additives are not. The PBI-PMF films were analyzed using pure and mixed gas permeability measurement techniques. At 250 °C, the data show H₂/CO₂ gas selectivities greater than 13. Also, from the gas permeation data, the energy of activation (Ep) of a mixed gas stream for PBI-PMF shows that hydrogen permeates more easily than the other gases, while the permeabilities for the larger kinetic diameter gases are greatly diminished. The FT-IR spectra show that the PBI-PMF films have changed from parent PBI after thermal processing, and PMF dominates the spectra even in minor percent compositions. Altogether, the reported PBI-PMF thermoset films show good stability which can be used for high temperature gas separation.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory, Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1357450

Alternate ID(s):: OSTI ID: 1326702

Report Number(s):: INL/JOU--15-36391; PII: S0376738816303325

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: C Vol. 515; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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