2-(4-aminophenyl)-5-aminobenzoxazole (APBOA)

Basic Information of APBOA

Product Name	2-(4-Aminophenyl)-5-aminobenzoxazole
Synonym	5-Amino-2-(4-aminophenyl)benzoxazole
Abbreviation	APBOA / DAPBO
CAS Number	13676-47-6
Product Type	Heteroaromatic benzoxazole diamine monomer
Molecular Formula	C13H11N3O
Molecular Weight	225.25 g/mol
Appearance	Off-white to tan solid
Purity	≥ 99%; batch data should be confirmed when COA is available
Main Application	Rigid, heat-resistant and specialty functional polyimide synthesis
Package	1 kg/bottle, 20 kg/drum, or customized packaging
Documents	SDS, TDS and available product information upon request; COA to be confirmed by batch availability
Storage	Keep sealed, dry, and away from moisture
Molecular Structure

Key Features in Polyimide Design

• Heteroaromatic benzoxazole diamine structure, relevant to rigid and heat-resistant polyimide diamine monomers.

• Rigid benzoxazole core may support molecular stiffness, thermal resistance and mechanical performance depending on the paired dianhydride and polymer architecture.

• Dual amine functionality makes APBOA suitable for evaluation with selected dianhydride monomers in high-performance PI synthesis.

• APBOA can be considered in specialty functional polyimide materials where rigidity, chemical resistance and structure-property control are important.

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

Pairing APBOA with Dianhydride Monomers

In polyimide synthesis, APBOA may be evaluated with selected polyimide dianhydride monomers to design rigid, heat-resistant and specialty 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.

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

Application Context of APBOA in Polyimide Systems

APBOA is typically used as a structural diamine monomer rather than a finished application material. It is commonly discussed in rigid, heat-resistant, membrane-related and specialty functional polyimide material development, where benzoxazole structure and aromatic rigidity can influence polymer performance.

• High-temperature polyimide applications – thermal resistance and rigid polymer material environments.

• Gas separation membrane research – APBOA-containing polyimide systems may be evaluated where molecular rigidity, free volume and gas transport behavior are important design factors.

• Electronics and semiconductor polyimide applications – insulation, dielectric and thermally stable material requirements.

• Specialty functional polyimide materials – benzoxazole-containing diamine selection for advanced polymer research.

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

• BPDA CAS 2420-87-3 – rigid aromatic dianhydride for low-CTE and high-temperature PI films.

• 6FDA CAS 1107-00-2 – fluorinated dianhydride often considered in transparent, low-dielectric and membrane-related PI systems.

• BTDA CAS 2421-28-5 – benzophenone-type aromatic dianhydride for thermally stable PI resins and coatings.

SDS, TDS and Technical Documentation

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