4-Aminobenzoic acid 4-aminophenyl ester (APAB)

Basic Information of APAB

Product Name	4-Aminobenzoic acid 4-aminophenyl ester
Abbreviation	APAB
CAS Number	20610-77-9
Product Type	Ester-containing aromatic diamine monomer
Molecular Formula	C13H12N2O2
Molecular Weight	228.25 g/mol
Appearance	Light yellow to brown powder or crystalline solid
Purity	≥ 99%; final batch data should be confirmed by latest COA
Main Application	Specialty, processable and heat-resistant polyimide synthesis
Package	1 kg/bottle, 20 kg/drum, or customized packaging
Documents	COA, SDS and TDS available upon request
Storage	Keep sealed, dry, and away from moisture
Molecular Structure

Key Features in Polyimide Design

• Ester-containing aromatic diamine structure, relevant to specialty and processable polyimide diamine monomers.

• Aromatic backbone may support molecular rigidity and thermal resistance depending on the paired dianhydride and polymer architecture.

• Ester linkage may help adjust processability, polarity and film-forming behavior in selected specialty polymer systems.

• APAB can be considered in specialty functional polyimide development where structural monomer design and polymer performance balance are important.

• Final material properties depend on monomer purity, dianhydride selection, solvent system, imidization conditions and polymer processing method.

Pairing APAB with Dianhydride Monomers

In polyimide synthesis, APAB may be evaluated with selected polyimide dianhydride monomers to design specialty, processable and heat-resistant PI systems. Rigid aromatic dianhydrides such as BPDA CAS 2420-87-3 or BTDA CAS 2421-28-5 may support thermal resistance and dimensional stability.

Ether-containing dianhydrides such as ODPA CAS 1823-59-2 may help adjust processability and film-forming behavior, while fluorinated dianhydrides such as 6FDA CAS 1107-00-2 may be considered when optical, dielectric or moisture-related properties are part of the target polymer design.

Application Context of APAB in Polyimide Systems

APAB is typically used as a structural diamine monomer rather than a finished application material. It is commonly discussed in specialty, heat-resistant and processable polyimide material development, where aromatic rigidity and ester-containing structure can influence polymer performance.

• Specialty functional polyimide development – ester-containing aromatic diamine selection for advanced polymer research.

• Flexible and processable polyimide formulations – processability, film formation and polymer design considerations.

• High-temperature polyimide applications – thermal resistance and high-performance polymer environments.

• Electronics and semiconductor polyimide applications – insulation, thermal endurance and specialty polymer material requirements.

Related Polyimide Monomer Supply Guides

For a broader technical overview of both diamine and dianhydride monomer families, please review Polyimide Monomers: Diamines and Dianhydrides.

Related Polyimide Monomers

• ABHQ CAS 22095-98-3 – aromatic diamine monomer with ester linkages for specialty polymer synthesis.

• BAPP CAS 13080-86-9 – ether-containing aromatic diamine for processable and heat-resistant polyimide systems.

• ODPA CAS 1823-59-2 – ether-containing dianhydride for processable and flexible PI systems.

COA, SDS and Technical Documentation

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