Li, Xin published the artcileInfluence of polybenzimidazole main chain structure on H2/CO2 separation at elevated temperatures, COA of Formula: C7H8BrClFN, the publication is Journal of Membrane Science (2014), 59-68, database is CAplus.
Four polybenzimidazole (PBI) derivatives were prepared to study the effects of main chain chem. and structure on H2/CO2 perm-selectivity of cast films. These structural variations were designed to exhibit high localized mobility at elevated temperatures, contain rigid and bent configurations that frustrated close chain packing, or possess bulky side groups. The modified PBIs exhibited high mol. weights, slightly lower thermal stabilities, and higher organo-solubilities compared with com. m-PBI. Dilute polymer solutions (<3.0 wt%) were used to fabricate high quality thin films under carefully optimized film processing conditions. Gas permeation properties of these PBI films were evaluated at elevated temperatures (up to 250 °C) and pressures (up to 50 psia). The main chain structural variations effectively disrupted the PBI chain packing resulting in much improved film H2 permeability (up to 997.2 barrer) compared with m-PBI (76.81 barrer) at 250 °C and 50 psia. However, lower H2/CO2 selectivities (5-7 (modified PBIs) vs. 23 (m-PBI)) were also measured and reflected the general trade-off between gas permeability and selectivity. When tested at 250 °C, PBI-based materials exhibited gas separation performance higher than the Robeson upper bound prediction and are promising materials for high temperature H2 separation from syngas.
Journal of Membrane Science published new progress about 147181-08-6. 147181-08-6 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Salt,Amine,Benzene, name is (4-Bromo-2-fluorophenyl)methanamine hydrochloride, and the molecular formula is C7H8BrClFN, COA of Formula: C7H8BrClFN.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary