Octadecyl acrylate
Octadecyl acrylate, identified by CAS 4813-57-4, is a long-chain monofunctional monomer characterized by its eighteen-carbon linear alkyl side chain attached to an acrylate ester group. Often referred to as stearyl acrylate, this compound appears as a waxy solid or a clear liquid depending on the ambient temperature, owing to its melting point near 30-35°C. Its primary chemical value lies in its ability to undergo radical polymerization, introducing significant hydrophobicity and internal lubrication to resulting polymer chains.
In industrial and research settings, octadecyl acrylate is valued for its low volatility and its role as a reactive diluent or a modifying co-monomer. Because of the long aliphatic tail, it significantly influences the crystallinity, solubility, and rheological properties of copolymers. Proper handling involves storage in cool, dark environments with appropriate polymerization inhibitors, as the material is sensitive to thermal and photo-induced initiation. It serves as a critical building block for creating specialized materials with tailored surface energies and thermal responses.
• This monomer is extensively utilized in the synthesis of pressure-sensitive adhesives and specialty coatings where it acts as an internal plasticizer. By incorporating the long octadecyl chain into the polymer backbone, manufacturers can lower the glass transition temperature and enhance the flexibility and tackiness of the final product. It is particularly effective in formulations requiring moisture resistance and improved adhesion to low-energy surfaces.
• In the textile and leather industries, octadecyl acrylate serves as a key component in water-repellent finishes and sizing agents. The hydrophobic nature of the stearyl group provides a durable barrier against aqueous penetration, making it ideal for high-performance outdoor fabrics and protective coatings. Its ability to co-polymerize with other acrylic monomers allows for the fine-tuning of hand-feel and durability in treated materials.
• The compound plays a vital role in the production of oil additives and pour-point depressants for the petroleum industry. When polymerized, the long-chain alkyl groups interact with paraffin wax crystals in crude oil or lubricating oils, preventing them from forming large networks at low temperatures. This modification ensures better flow characteristics and pumpability in cold climates, which is essential for efficient fuel transport.
• Additionally, octadecyl acrylate is employed in the development of comb-like polymers and side-chain crystalline polymers for advanced material science applications. These materials are investigated for use in phase-change energy storage and responsive membranes. The precise control over the side-chain crystallization temperature allows researchers to design smart materials that undergo sharp physical transitions in response to thermal stimuli.
Product Name: Octadecyl acrylate
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