Polyimide Dianhydride Monomers Supplier | 6FDA, BPDA, ODPA
Polyimide dianhydride monomers are key building blocks for high-performance polyimide synthesis. In a common two-step route, dianhydrides react with diamines to form polyamic acid precursors, which are then converted into polyimides through thermal or chemical imidization. By changing the dianhydride structure, polymer developers can adjust thermal resistance, dimensional stability, coefficient of thermal expansion, optical transparency, dielectric behavior, solubility, processability and film-forming properties.
Aure Chemical is a China-based chemical supplier and exporter of selected high-purity polyimide dianhydride monomers, including aromatic dianhydrides, fluorinated dianhydrides, ether-containing dianhydrides and alicyclic dianhydrides. These monomers are used in transparent and colorless polyimide films, low-dielectric materials, low-CTE polyimide films, flexible electronics, semiconductor packaging, heat-resistant films, coatings and advanced polymer R&D.
This page serves as a technical sourcing guide for polyimide dianhydride monomers and connects to Aure Chemical’s broader Polyimide Monomers: Diamines and Dianhydrides topic page.
Role of Dianhydride Monomers in Polyimide Design
The dianhydride structure strongly influences the final polyimide backbone. Rigid aromatic dianhydrides are often selected when thermal stability, low CTE, mechanical strength and dimensional stability are important. Fluorinated dianhydrides may help reduce charge-transfer interactions, lower polarizability and support transparent or low-dielectric polyimide systems depending on the full polymer design. Ether-containing dianhydrides can help improve solubility, flexibility, processability and film-forming behavior.
Thermal resistance: rigid aromatic dianhydrides can support high-temperature performance and chain rigidity.
Dimensional stability and low CTE: linear and rigid dianhydride structures may support molecular orientation and dimensional control in PI films.
Optical transparency: fluorinated or alicyclic dianhydrides may help reduce coloration by disrupting charge-transfer interactions.
Dielectric properties: bulky or fluorinated structures may reduce polarizability and moisture uptake depending on the polymer structure.
Processability: ether-containing dianhydrides can help improve solubility, flexibility and film-forming behavior.
In practical material development, dianhydride selection should always be considered together with the paired diamine, monomer purity, stoichiometry, solvent system, imidization method, film formation conditions and application requirements.
Main Types of Polyimide Dianhydride Monomers
Aromatic Dianhydrides
Aromatic dianhydrides are widely used to design polyimides with high thermal stability, mechanical strength, dimensional stability and low CTE. Rigid aromatic structures are often selected for heat-resistant films, electronic materials, semiconductor packaging and high-performance coatings.
Representative examples include BPDA CAS 2420-87-3, a rigid biphenyl-type dianhydride often used in low-CTE and high-temperature PI film systems, and BTDA CAS 2421-28-5, a benzophenone-type aromatic dianhydride used in thermally stable polyimide resins, coatings and specialty polymer systems.
Fluorinated Dianhydrides
Fluorinated dianhydrides introduce bulky fluorinated groups into the polyimide backbone. These structures may help reduce interchain charge-transfer interactions, lower polarizability and support optical transparency, low dielectric constant and reduced moisture uptake depending on polymer design.
A representative example is 6FDA CAS 1107-00-2, a fluorinated dianhydride frequently considered for transparent, colorless, low-dielectric and high-performance polyimide systems.
Ether-Containing Dianhydrides
Ether-containing dianhydrides contain flexible ether linkages that may improve chain mobility, solubility, processability and film-forming performance. These monomers are often considered when a polyimide system needs a balance between heat resistance, flexibility and processability.
For example, ODPA CAS 1823-59-2 is an ether-containing dianhydride used in flexible, processable and heat-resistant polyimide systems.
Alicyclic Dianhydrides
Alicyclic dianhydrides such as HPMDA and CBDA can be considered in specialty polyimide designs where reduced coloration and optical transparency are priorities. Their non-aromatic or partially alicyclic structures may help reduce charge-transfer interactions, but the final balance of transparency, thermal resistance and mechanical performance depends on the complete polymer architecture.
Key Polyimide Dianhydride Products
| Product | CAS No. | Dianhydride Type | Typical Role in PI Design |
|---|---|---|---|
| 6FDA CAS 1107-00-2 | 1107-00-2 | Fluorinated dianhydride | Transparent, colorless, low-dielectric and low-moisture-uptake PI systems. |
| BPDA CAS 2420-87-3 | 2420-87-3 | Rigid aromatic dianhydride | Low-CTE, high-temperature and electronic-grade polyimide films. |
| ODPA CAS 1823-59-2 | 1823-59-2 | Ether-containing dianhydride | Improved solubility, processability, flexibility and film-forming behavior. |
| BTDA CAS 2421-28-5 | 2421-28-5 | Benzophenone-type aromatic dianhydride | Thermally stable polyimide resins, coatings and specialty polymer systems. |
Application Guide for Polyimide Dianhydride Monomers
| Application Direction | Recommended Dianhydride Features | Typical Product Examples | Material Design Purpose |
|---|---|---|---|
| Transparent and colorless polyimide | Fluorinated, bulky or alicyclic structures that can reduce charge-transfer interactions. | 6FDA, HPMDA, CBDA | Improve optical transparency and reduce coloration while maintaining useful heat resistance. |
| Low-dielectric polyimide | Low-polarizability and high-free-volume dianhydride structures. | 6FDA and other fluorinated dianhydrides | Support reduced dielectric constant, lower moisture uptake and electronic material performance. |
| High-temperature polyimide | Rigid aromatic dianhydride backbones. | BPDA, BTDA | Improve thermal stability, chain rigidity and mechanical performance. |
| Low-CTE polyimide films | Linear and rigid dianhydride structures that may support in-plane molecular orientation. | BPDA | Support dimensional stability for flexible substrates and electronic materials. |
| Flexible electronics | Dianhydrides that balance rigidity, flexibility and processability. | BPDA, ODPA, 6FDA | Support film toughness, bendability, thermal endurance and process stability. |
| Semiconductor packaging | Low-CTE, low-dielectric and heat-resistant dianhydride systems. | BPDA, 6FDA, ODPA, BTDA | Support insulation performance, dimensional stability and high-temperature processing. |
| Heat-resistant films and coatings | Rigid aromatic or benzophenone-type dianhydrides. | BTDA, BPDA, ODPA | Improve thermal endurance, coating durability and film-forming performance. |
| Advanced polymer R&D | Specialty dianhydrides with fluorinated, aromatic, ether-containing or alicyclic structures. | 6FDA, BPDA, ODPA, BTDA, HPMDA, CBDA | Enable structure-property optimization for new PI systems. |
How to Select a Dianhydride Monomer
For transparent or colorless polyimide, fluorinated dianhydrides such as 6FDA or alicyclic dianhydrides such as HPMDA and CBDA can be considered because bulky or non-aromatic structures may help reduce charge-transfer interactions and coloration depending on polymer architecture.
For low-dielectric PI systems, fluorinated or bulky dianhydrides may help lower polarizability and moisture uptake. For high-temperature or low-CTE PI systems, rigid aromatic dianhydrides such as BPDA or BTDA are often selected. For better processability, solubility and film flexibility, ether-containing dianhydrides such as ODPA may be useful options.
In electronic materials and semiconductor packaging, dianhydride selection should be evaluated together with dielectric properties, coefficient of thermal expansion, adhesion, moisture uptake, thermal stability, film toughness, solvent compatibility and processing window. Final performance depends on both dianhydride and diamine selection.
Pairing Dianhydrides with Diamines
Polyimide design depends on both dianhydride and diamine structures. 6FDA is often considered with fluorinated diamines such as TFMB / TFDB for transparent and low-dielectric PI systems. BPDA or BTDA can be paired with suitable aromatic diamines for heat-resistant and low-CTE PI designs. ODPA can be paired with ether-containing or fluorinated diamines when processability and flexibility are important.
For related information on the diamine side of PI design, review Aure Chemical’s Polyimide Diamine Monomers guide. For a broader overview of both monomer families, visit Polyimide Monomers: Diamines and Dianhydrides.
Documentation and Supply Support
Aure Chemical can support B2B buyers with COA, SDS, TDS, typical specifications, packaging information and export shipment discussion for selected polyimide dianhydride monomers. Availability, purity, documentation and packing options may vary by product and project requirement.
For export orders, please provide the target product, CAS number, quantity, destination country or port, preferred packaging and required documents. We can then check available product information, shipment feasibility and documentation support before preparing quotation feedback.
Request a Quotation
To request product information or pricing for polyimide dianhydride monomers, please provide:
Product name and CAS number
Required purity and target specification
Quantity required
Destination country or destination port
Preferred packaging method
Required documents, such as COA, SDS or TDS
Application direction, such as transparent PI, low-dielectric PI, electronic materials or heat-resistant films
Aure Chemical will review the inquiry details and provide available product information, documentation support and quotation feedback accordingly.
Related Polyimide Monomer Pages
References and Further Reading
Ratta, V., Polyimides: Chemistry & Structure-Property Relationships, Virginia Polytechnic Institute and State University, 1999. This work summarizes the two-step polyamic acid route and structure-property relationships in polyimide materials.
Zuo, H. T. et al., Highly Transparent and Colorless Polyimide Film with Low Dielectric Constant, Chinese Journal of Polymer Science, 2021. This paper presents a structure design strategy involving trifluoromethyl groups and meta-substituted structures.
Nagella, S. R. et al., Structural Designs of Transparent Polyimide Films with Low Dielectric Properties and Low Water Absorption: A Review, Nanomaterials, 2023. This review discusses structural approaches for transparent, low-dielectric and low-water-absorption PI films.
Kwac, L. K. et al., Comparison of the Properties of Polyimides Derived from Various Dianhydride and Diamine Monomers, RSC Advances, 2025. This paper compares thermomechanical properties, optical transparency and solubility of PI films based on different dianhydride and diamine monomers.
Shi, Y. et al., High Comprehensive Properties of Colorless Transparent Polyimide Films, RSC Advances, 2024. This study discusses colorless transparent PI films and monomer design involving fluorinated and ether-containing structures.
Kwac, L. K. et al., Comparison of Properties of Colorless and Transparent Polyimide Hybrid Films, ACS Omega, 2021. This paper discusses optical transparency and the influence of monomer design on colorless PI films.