3-Vinylaniline cas 15411-43-5: A Versatile Bifunctional Monomer for Functional Polymer Synthesis and

3-Vinylaniline cas:15411-43-5, also known as 3-aminostyrene, is a versatile aromatic monomer that combines two highly reactive functionagroups within a single molecular framework: a polymerizable vinyl group and a primary amino group located at the meta position of the benzene ring. This bifunctional structure enables simultaneous participation in free-radical polymerization and post-polymerization chemical modification, making 3-vinylaniline an important intermediate in advanced polymer chemistry.

Unlike conventional styrene monomers, 3-vinylaniline not only contributes to polymer backbone formation but also introduces chemically addressable amino functionalities, providing opportunities for molecular engineering, surface functionalization, and the preparation of responsive materials.

Molecular Structure and Chemical Properties

• Chemical Name: 3-Vinylaniline
• Synonym: 3-Aminostyrene
• Molecular Formula: C8H9N
• Molecular Weight: 119.16 g/mol

The molecular structure consists of:

• A vinyl group (-CH=CH₂) capable of radical polymerization.
• A primary aromatic amino group (-NH₂) that undergoes a variety of organic transformations.
• A rigid aromatic backbone that enhances thermal stability and mechanical performance in polymeric materials.

This dual-functionality distinguishes 3-vinylaniline from many conventional vinyl monomers and significantly broadens its application potential.

Dual Reactivity: Polymerization and Functionalization

One of the most valuable characteristics of 3-vinylaniline is the independent reactivity of its two functional groups.

Polymerizable Vinyl Group

The vinyl moiety readily participates in free-radical polymerization with numerous vinyl monomers, including:

• Styrene
• Acrylic acid and acrylates
• Methacrylates
• Acrylonitrile
• Vinyl acetate

These copolymerization reactions enable precise regulation of:

• Glass transition temperature (Tg)
• Mechanical strength
• Hydrophilicity
• Surface functionality

Reactive Amino Group

The aromatic amino functionality provides numerous opportunities for chemical derivatization.

Typical reactions include:

• Acylation
• Alkylation
• Schiff base formation
• Diazotization
• Urea and urethane synthesis
• Epoxy curing reactions

These transformations allow the introduction of catalytic sites, fluorescent probes, biologically active molecules, and crosslinkable functionalities into polymer systems.

Applications in Functional Polymer Synthesis

Functional Copolymers

3-Vinylaniline is widely employed as a functional comonomer for preparing polymers containing pendant amino groups.

Such polymers exhibit enhanced:

• Chemical reactivity
• Adhesion properties
• Surface wettability
• Ion-exchange capability

Applications include specialty coatings, membrane materials, and functional adhesives.

Surface Modification

The amino functionality provides convenient anchoring sites for surface engineering.

Typical modification strategies include:

• Covalent immobilization of biomolecules
• Attachment of nanoparticles
• Grafting of polyethylene glycol (PEG)
• Preparation of antifouling coatings

These approaches are particularly valuable in biomedical materials and analytical devices.

High-Performance Thermosetting Systems

Because aromatic amines readily react with epoxy resins and isocyanates, 3-vinylaniline derivatives are frequently incorporated into advanced thermosetting networks.

Benefits include:

• Higher crosslink density
• Improved thermal stability
• Enhanced solvent resistance
• Increased mechanical strength

Such materials are widely investigated for structural composites and electronic encapsulation.

Applications in Organic Electronics

The conjugated aromatic framework and modifiable amino group make 3-vinylaniline useful for the synthesis of functional electronic materials.

Research applications include:

• Conductive polymers
• Hole-transport materials
• Electrochromic polymers
• Organic semiconductor precursors
• Photoresponsive polymer systems

Chemical modification of the amino group allows tuning of molecular energy levels and charge transport behavior.

Role in Advanced Functional Materials

Recent studies have expanded the use of 3-vinylaniline in the preparation of smart materials, including:

• Stimuli-responsive polymers
• Molecularly imprinted polymers (MIPs)
• Fluorescent sensing materials
• Catalytic polymer supports
• Metal-ion adsorption materials

The presence of amino groups enables selective interactions through hydrogen bonding and metal coordination, making these polymers attractive for sensing and separation technologies.

Conclusion

3-Vinylaniline is a highly versatile bifunctional aromatic monomer that integrates efficient vinyl polymerization with the rich synthetic chemistry of aromatic amines. Its unique structural characteristics enable the preparation of polymers with precisely controlled architectures and chemically addressable functional groups.

These advantages have established 3-vinylaniline as an important building block in functional polymer synthesis, surface engineering, organic electronics, and advanced materials research, where molecular design and post-polymerization modification are essential for achieving high-performance materials.