Nano-ordered aromatic/alicyclic polybenzimidazole blend membranes

In the present work, polybenzimidazole (PBI) containing aliphatic (cyclohexane based, ARB-0, I.V. = 1.5 dL/g) and aromatic (terephthalic acid based, ARB-100, I.V. = 3.46 dL/g) backbones were synthesized. On blending the two polymers, PBIs with tunable mechanical and proton conductivity were achieved...

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Bibliographic Details
Published in:Reactive & functional polymers 2020-01, Vol.146, p.104312, Article 104312
Main Authors: Satheesh Kumar, B., Sana, Balakondareddy, Unnikrishnan, G., Jana, Tushar, Santhosh Kumar, K.S.
Format: Article
Language:English
Subjects:
Aliphatic compounds
Aromatic-aliphatic blend PBIs
Conductivity
Cyclohexane
Elongation
Local ordering
Mechanical properties
Modulus of elasticity
Morphology
Polybenzimidazoles
Polymers
Proton conductivity
Protons
Terephthalic acid
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Summary:In the present work, polybenzimidazole (PBI) containing aliphatic (cyclohexane based, ARB-0, I.V. = 1.5 dL/g) and aromatic (terephthalic acid based, ARB-100, I.V. = 3.46 dL/g) backbones were synthesized. On blending the two polymers, PBIs with tunable mechanical and proton conductivity were achieved. ARB-0 exhibited proton conductivity of 114 mS/cm whereas ARB-100 marked a high value of 220 mS/cm at 160 °C. ARB-100 resulted in high tensile modulus of 11 GPa meanwhile ARB-0 exhibited 2 GPa only. The corresponding elongations were 2 and 27% respectively. The aliphatic-aromatic blends resulted in good elongation, modulus and conductivity. The aromatic rich blend composition (ARB-67) displayed maximum proton conductivity (240 mS/cm) and morphology exhibited local ordering behavior due to aliphatic-aromatic intra-chain interactions.
ISSN:1381-5148
1873-166X
DOI:10.1016/j.reactfunctpolym.2019.06.020