Chemical Identity and Physical Properties

N-(p-tolyl)acrylamide, systematically named N-(4-methylphenyl)prop-2-enamide, is an aromatic acrylamide derivative bearing a para-methyl substituent on the aniline nitrogen. Its molecular formula is C₁₀H₁₁NO with a molecular weight of approximately 161.20 g/mol. The compound typically presents as a white to off-white crystalline solid at room temperature.

The molecule combines the reactive vinyl group of acrylamide with the lipophilicity and electron-donating character introduced by the para-tolyl (4-methylphenyl) group. The amide nitrogen participates in resonance with both the carbonyl and the aromatic ring, reducing nitrogen nucleophilicity relative to aliphatic acrylamides and imparting greater thermal stability to derived polymers. The vinyl double bond (C=C) remains the primary site of reactivity, enabling participation in free-radical and controlled/living polymerization schemes.

Key physical property data should be confirmed against the Certificate of Analysis supplied with each lot from Aladdin Scientific (SKU N768604). Storage under cool, dry, dark conditions and away from radical initiators is standard practice for acrylamide monomers.

Synthesis and Handling

N-(p-tolyl)acrylamide is most commonly prepared by acylation of p-toluidine (4-methylaniline) with acryloyl chloride or acrylic anhydride in the presence of a base such as triethylamine, carried out in an anhydrous aprotic solvent (e.g., dichloromethane or tetrahydrofuran) at low temperature to minimize Michael addition side reactions. The product is isolated by aqueous workup and recrystallization.

Alternative routes include Ritter-type reactions and enzymatic acylation; however, the acryloyl chloride route remains the most widely employed at laboratory scale due to its straightforward execution and high yield.

When handling N-(p-tolyl)acrylamide, researchers should observe standard precautions applicable to acrylamide derivatives: use of appropriate personal protective equipment (gloves, lab coat, eye protection), work in a well-ventilated fume hood, and avoidance of contact with skin and mucous membranes. Consult the Safety Data Sheet (SDS) for full hazard information before use. The monomer may contain a polymerization inhibitor; removal prior to polymerization should follow established protocols (e.g., inhibitor-removal columns or base washing).

Polymerization Behavior and Polymer Properties

As an N-aryl acrylamide, N-(p-tolyl)acrylamide undergoes efficient free-radical homopolymerization under standard conditions (thermal or photo-initiated). The para-methyl group modestly raises the ceiling temperature and glass transition temperature (Tg) of the resulting poly(N-(p-tolyl)acrylamide) relative to poly(acrylamide), reflecting the increased steric bulk and hydrophobicity.

The monomer is well-suited to controlled radical polymerization techniques including Reversible Addition–Fragmentation Chain Transfer (RAFT) polymerization and Atom Transfer Radical Polymerization (ATRP), enabling the preparation of well-defined polymers with narrow dispersity (Đ) and targeted molecular weights. These techniques also facilitate synthesis of block copolymers, gradient copolymers, and star-shaped architectures when N-(p-tolyl)acrylamide is combined with hydrophilic or functional co-monomers.

Copolymerization with acrylamide, N-isopropylacrylamide (NIPAM), methacrylic acid, or acrylate esters produces materials with adjustable hydrophilicity, thermal responsiveness, and mechanical stiffness. Specific Tg values, polymerization kinetics, and dispersity data depend on reaction conditions and should be determined experimentally or sourced from peer-reviewed literature.

Research Applications

Functional Polymer Synthesis: N-(p-tolyl)acrylamide serves as a building block for hydrophobic acrylamide-based polymers and amphiphilic block copolymers. The pendant aryl group can participate in π–π stacking interactions, making it useful for the fabrication of self-assembled nanostructures, thin films, and organogels.

Stimuli-Responsive and Smart Materials: When incorporated into copolymer systems alongside thermoresponsive monomers such as NIPAM, the hydrophobic tolyl units modulate the lower critical solution temperature (LCST) of the resulting copolymer, enabling fine-tuned thermal responsiveness for drug delivery and sensing applications.

Coatings and Adhesives: The combination of amide hydrogen-bonding capability with aryl hydrophobicity makes N-(p-tolyl)acrylamide-derived polymers candidates for specialty coatings, pressure-sensitive adhesives, and surface-modification layers.

Crosslinked Networks and Hydrogels: In the presence of bifunctional crosslinkers, N-(p-tolyl)acrylamide can form crosslinked polymer networks and hydrogels with enhanced mechanical properties compared to pure polyacrylamide gels, potentially useful in tissue engineering scaffolds and separation media.

Model Compound Studies: The well-defined structure and moderate reactivity of N-(p-tolyl)acrylamide make it a valuable model monomer in kinetic and mechanistic studies of acrylamide polymerization.

Ordering Information

N-(p-tolyl)acrylamide is available from Aladdin Scientific under SKU N768604. Researchers are encouraged to request a Certificate of Analysis (CoA) to confirm purity, appearance, and inhibitor content prior to use in sensitive polymerization experiments. For bulk or custom quantities, please contact Aladdin Scientific's procurement team directly.

Proper documentation—including SDS and CoA—is provided with each order. Ensure compliance with your institution's chemical inventory and waste-disposal regulations when ordering acrylamide-class compounds.