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CHM.11123 - Hexadecyltrimethoxysilane - technical, ≥85% (GC) - CAS: 16415-12-6
Hexadecyltrimethoxysilane is a long-chain alkylsilane that is widely used to impart hydrophobic properties to surfaces and to improve the compatibility of inorganic materials with organic polymers.
1. Key Applications
  • Surface Modification
    • Hydrophobic Coatings: Used to modify surfaces (e.g., glass, metals, ceramics) to make them water-repellent.
    • Anti-Corrosion: Applied to metal surfaces to prevent corrosion by forming a protective hydrophobic layer.
  • Coupling Agent
    • Polymer Composites: Acts as a coupling agent in composite materials to improve adhesion between inorganic fillers (e.g., silica, glass fibers) and organic polymers (e.g., rubbers, plastics).
    • Reinforcement: Enhances the mechanical properties of composites by improving interfacial bonding.
  • Fillers and Pigments
    • Surface Treatment of Fillers: Used to treat inorganic fillers (e.g., silica, calcium carbonate) to improve their dispersion and compatibility in polymer matrices.
    • Pigment Stabilization: Helps stabilize pigments in coatings and inks.
  • Adhesives and Sealants
    • Adhesion Promoter: Improves the adhesion of adhesives and sealants to various substrates, including glass, metals, and ceramics.
  • Coatings and Paints
    • Water-Repellent Coatings: Incorporated into coatings and paints to provide water resistance and durability.
    • Anti-Graffiti Coatings: Used in anti-graffiti coatings to make surfaces easier to clean.
  • Textiles and Leather
    • Waterproofing Agent: Applied to textiles and leather to impart water-repellent properties.
  • Construction Materials
    • Concrete and Mortar Additive: Used to improve the water resistance and durability of concrete and mortar.
    • Stone Protection: Applied to natural stone surfaces to protect against water absorption and staining.
  • Electronics and Optics
    • Optical Coatings: Used in optical coatings to modify surface properties and improve performance.
    • Electronic Encapsulation: Enhances the moisture resistance of electronic components.
  • Nanotechnology
    • Nanoparticle Functionalization: Used to functionalize nanoparticles for improved dispersion and compatibility in various applications.
  • Research and Development
    • Material Science: Investigated for use in advanced materials, including self-assembled monolayers (SAMs) and hybrid organic-inorganic materials.
2. Industrial and Commercial Uses
  • Automotive Industry: Used in coatings, adhesives, and sealants for vehicles.
  • Construction Industry: Applied in waterproofing and protective coatings for buildings and infrastructure.
  • Textile Industry: Used to produce water-repellent fabrics.
  • Electronics Industry: Enhances the performance and durability of electronic components.
3. Handling and Processing
  • Hydrolysis and Condensation: Hexadecyltrimethoxysilane undergoes hydrolysis in the presence of moisture, forming silanol groups that can condense to create a stable, hydrophobic layer on surfaces.
  • Application Methods: Can be applied via dipping, spraying, or brushing, depending on the substrate and desired outcome.
4. Environmental and Safety Considerations
  • Toxicity: Generally low toxicity, but proper handling procedures should be followed to avoid skin and eye contact.
  • Environmental Impact: Should be used and disposed of in accordance with local regulations to minimize environmental impact.
 

CHM.11123 - Hexadecyltrimethoxysilane - technical, ≥85% (GC) - CAS: 16415-12-6

SKU: CHM.11123
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  • 1. General Information

    • Chemical Name: Hexadecyltrimethoxysilane

    • CAS Number: 16415-12-6

    • Molecular Formula: C₁₉H₄₂O₃Si

    • Molecular Weight: 346.63 g/mol

    • Appearance: Colorless to pale yellow liquid

    • Purity: ≥85% (technical grade, with impurities typically including other silanes or by-products)

    2. Chemical Structure

    • Structure: CH₃(CH₂)₁₅Si(OCH₃)₃

    • Functional Groups:

      • Three methoxy (–OCH₃) groups attached to silicon.

      • A long hydrophobic hexadecyl (C₁₆H₃₃) chain.

    3. Solubility

    • Organic Solvents: Soluble in common organic solvents such as ethanol, acetone, toluene, and hexane.

    • Water: Insoluble in water but hydrolyzes in the presence of moisture to form silanol groups (–SiOH).

    4. Reactivity

    • Hydrolysis: Reacts with water to form silanol groups (–SiOH), which can further condense to form siloxane bonds (–Si–O–Si–).

      CH3(CH2)15Si(OCH3)3+3H2O→CH3(CH2)15Si(OH)3+3CH3OHCH3​(CH2​)15​Si(OCH3​)3​+3H2​O→CH3​(CH2​)15​Si(OH)3​+3CH3​OH

    • Condensation: Silanol groups can condense to form crosslinked structures:

      CH3(CH2)15Si(OH)3→CH3(CH2)15Si–O–Si+H2OCH3​(CH2​)15​Si(OH)3​→CH3​(CH2​)15​Si–O–Si+H2​O

    • Reactivity with Surfaces: Reacts with hydroxyl (–OH) groups on surfaces (e.g., glass, metals, ceramics) to form stable covalent bonds, imparting hydrophobic properties.

    5. Thermal Properties

    • Boiling Point: ~320°C (estimated, may vary with purity).

    • Flash Point: >100°C (flammable liquid).

    • Thermal Stability: Stable under normal conditions but may decompose at high temperatures.

    6. Physical Properties

    • Density: ~0.88–0.90 g/cm³ at 25°C.

    • Refractive Index: ~1.42–1.44 (typical for organosilanes).

    • Viscosity: Low to moderate viscosity liquid.

    7. Chemical Stability

    • Stability: Stable under dry conditions but hydrolyzes in the presence of moisture.

    • Storage: Should be stored in a cool, dry place in tightly sealed containers to prevent hydrolysis.

    8. Functional Properties

    • Hydrophobicity: Imparts water-repellent properties to surfaces due to the long hydrophobic alkyl chain (C₁₆H₃₃).

    • Adhesion Promotion: Improves adhesion between inorganic materials (e.g., glass, metals) and organic polymers (e.g., plastics, rubbers).

    • Surface Modification: Forms self-assembled monolayers (SAMs) on surfaces, altering their wettability and chemical reactivity.

    9. Compatibility

    • Inorganic Surfaces: Compatible with glass, metals, ceramics, and other hydroxylated surfaces.

    • Organic Polymers: Compatible with polymers such as polyethylene, polypropylene, and rubbers when used as a coupling agent.

    10. Impurities (Technical Grade, ≥85%)

    • Typical Impurities: May include other silanes, by-products of synthesis, or unreacted starting materials.

    • Impact of Impurities: Impurities may affect reactivity, hydrolysis rate, and performance in specific applications.

    11. Environmental and Safety Considerations

    • Toxicity: Generally low toxicity, but may cause irritation to skin and eyes. Proper handling (gloves, goggles) is recommended.

    • Flammability: Combustible liquid; keep away from open flames and high temperatures.

    • Environmental Impact: Hydrolysis products (e.g., methanol) should be handled and disposed of according to local regulations.

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