Derived from aromatic heterocyclic polymers, polybenzimidazole (PBI) films can withstand extreme temperatures—often exceeding 400°C—and maintain structural integrity in harsh chemical environments. Their unique molecular structure, featuring recurring benzimidazole rings, imparts low gas permeability and excellent dimensional stability, making them ideal for use in fuel cells, gas separation membranes, electrical insulation, and high-temperature filtration systems.
As a trusted supplier of advanced plastic materials, Alfa Chemistry offers PBI films tailored to meet the rigorous demands of aerospace, energy, electronics, and industrial applications.
| Items | PL-PBI-A004 | PL-PBI-A005 | PL-PBI-A006 | PL-PBI-A007 | PL-PBI-A008 | PL-PBI-A009 | PL-PBI-A010 |
| Molecular Weight | 40,000 | 40,000 | 60,000 | 60,000-100,000 | 60,000-100,000 | 60,000-100,000 | 60,000-100,000 |
| Thickness | 25 μm | 35 μm | 55 μm | 30 μm | 35 μm | 40 μm | 50 μm |
| Appearance | Transparent tea brown | Transparent tea brown | |||||
| Tensile Strength | ≥100 Mpa | 130-200 Mpa | |||||
| Size | 10cm*10cm, 20cm*30cm | 3cm*3cm, 15cm*15cm, 15cm*30cm, 1m2 | |||||
| Weight | -- | 35-75 g/m2 | |||||
| Elongation at Break | -- | 30-50% | |||||
| Thermal stability | -- | ≥400℃ | |||||
| Acid Uptake | -- | 400-450 wt.% | |||||
| Dimensional Swelling Rate | -- | 35±5 % | |||||
| Thickness Swelling Rate | -- | 75±5 % | |||||
| Tensile Strength (420wt.% acid uptake) | -- | 12-15 Mpa | |||||
| Proton Conductivity (420wt.% acid uptake, 160℃, RH=0%) | -- | 100-120 mS/cm | |||||
| Hydrogen Permeation Current Density | -- | 1-2 mA/cm2 | |||||
The fabrication of PBI films, critical for their high-performance applications, primarily employs three key methods: Solution Casting, the Sol-Gel (PPA) process, and Direct Acid Casting. Each technique offers distinct advantages in controlling film properties and processing efficiency.
This is the most common technique. PBI polymer is dissolved in strong polar organic solvents (e.g., DMAc, NMP). The solution is then cast onto a substrate, and the solvent is evaporated, yielding a uniform PBI film. This method allows for precise control over film thickness and morphology.
An advanced and eco-friendlier approach, the PPA (Polyphosphoric Acid) process uses PPA as both the polymerization medium and casting solvent, eliminating organic solvents. It produces high molecular weight PBI, enhancing mechanical strength and conductivity, and simplifies the overall manufacturing process.
This method directly incorporates acidic monomers with the PBI polymer during casting, forming inherently acid-doped membranes. It reduces organic solvent use and can improve film uniformity and stability, offering a streamlined route for proton-conductive PBI films.
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