Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.
Product Description
Matrimid® 5218 (CAS: 104983-64-4) is a soluble thermoplastic polyimide (TPI) developed by Huntsman, formed by polycondensation of BTDA and DAPI. Fully imidized during manufacture, it has excellent thermal stability, high Tg, good chemical resistance and processability. It is widely used in gas separation membranes, high-performance films, coatings, composites, adhesives and aerospace/electronic components, and also acts as a flexibilizer.
Molecular Formula & Structure
Repeating Unit Formula: C??H??N?O?
Physical Properties
- Appearance: Light yellow to yellow crystalline powder (industrial grade)
- Glass Transition Temperature (Tg): 305–315 °C (DMA); 319~327 °C (DSC, micro powder)
- Melting Point: > 500 °C (decomposes)
- Density: ~1.20–1.25 g/cm3 (25 °C)
- Solubility: Soluble in CH?Cl?, THF, DMAC, DMF, NMP; insoluble in water, hexane, methanol
- Thermal Stability: Decomposition temperature > 550 °C (N?); weight loss ≤1.5% at 250 °C (0.5h, N?)
- Intrinsic Viscosity: 0.37–1.07 dL/g (commonly 0.6–0.8 dL/g, NMP, 25 °C)
- Particle Size: D50 ≤20–25 μm, D90 ≤45 μm (micro powder grade)
- Apparent Density: ≥0.25–0.30 g/mL (25 °C)
- Water Absorption: ≤0.87% (25℃&65%RH, 24h, film)
Chemical Properties
- CAS Number: 104983-64-4 (confirmed); alternative CAS: 62929-02-6
- Polymer Type: Aromatic polyimide, thermoplastic, fully imidized (≥99%)
- Repeating Unit Molecular Weight: 580.61
- Chemical Resistance: Resistant to water, steam, dilute acids, alkalis and non-polar solvents
- Compatibility: Compatible with epoxies, other polymers and common fillers
- Application Type: Polymer additive (flexibilizer), membrane material, film casting
- Other Properties: Low thermal expansion coefficient, dielectric constant (~2.70), refractive index (1.639)
Synthesis Method
- Monomers: 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), 5(6)-amino-1-(4′-aminophenyl)-1,3,3-trimethylindane (DAPI/PIDA)
- Polymerization: Solution polycondensation in polar aprotic solvents (80–150 °C), followed by chemical/thermal imidization.
- Reaction Steps: Dissolve monomers, conduct polycondensation and imidization, precipitate, wash and dry to get the product.
Storage & Safety
- Storage: Sealed, cool, dry and dark place (15–30 °C); avoid moisture, sunlight, high temperature and strong oxidants.
- Package: Moisture-proof, light-proof container (1 kg/bag or 25 kg/drum).
- Safety: Avoid skin/eye contact and dust inhalation; wear PPE during operation; non-flammable/explosive.
- Hazard: Thermal decomposition releases harmful gases (CO, CO?, NO?); avoid high-temperature exposure.
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