Polybenzimidazole-nanocomposite membranes: Enhanced proton conductivity with low content of amine-functionalized nanoparticles
| Autor: | G. Unnikrishnan, K. S. Santhosh Kumar, Dona Mathew, Balakondareddy Sana, B. Satheesh Kumar, Tushar Jana |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Polymers and Plastics Organic Chemistry Nanoparticle 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Dicarboxylic acid Membrane chemistry Pyridine Materials Chemistry Amine gas treating 0210 nano-technology Phosphoric acid Nuclear chemistry |
| Zdroj: | Polymer. 145:434-446 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2018.04.081 |
| Popis: | In this work, a pyridine based polybenzimidazole (PPBI) is synthesized (I.V. 3.3 dL/g) from pyridine dicarboxylic acid and hydrochloride salt of diaminobenzidine. The polymer is characterized by FTIR and 13C CP-MAS NMR. The resultant PPBI possesses high storage modulus of >10 GPa, tensile modulus of ∼1 GPa and tensile strength of ∼150 MPa. Amine functionalized silica nanoparticles in different degrees of amine grafting (LAC-low amine content/HAC-high amine content) are successfully incorporated into PPBI to result nanocomposite membranes. Both the neat PPBI and nanocomposites exhibit significant affinity towards phosphoric acid as indicated by the high acid uptake in short time (5 h). Proton conductivity of nanocomposites is increased by the addition of LAC/HAC nanoparticles (>250 mS/cm at 140 °C). The HAC nanoparticle enriched nanocomposite (HAC 7) reveals self-assembly of amino-silica nanoparticles due to base-base repulsion (imidazole-amine). Hydrophobicity of nanocomposite membranes is increased with increase in LAC/HAC content which is attributed to the strengthening of hydrogen bonding between PPBI and nanoparticles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect