Triethoxyoctylsilane
[CAS# 2943-75-1]

Identification

• Classification: Chemical reagent >> Organic reagent >> Silane
• Name: Triethoxyoctylsilane
• Synonyms: n-Octyltriethoxysilane
• Molecular Formula: C₁₄H₃₂O₃Si
• Molecular Weight: 276.49
• CAS Registry Number: 2943-75-1
• EC Number: 220-941-2
• SMILES: CCCCCCCC[Si](OCC)(OCC)OCC

Properties

• Density: 0.88
• Boiling point: 98 °C
• Refractive index: 1.416-1.418
• Flash point: 100 °C
• Water solubility: reacts

Safety Data

• Hazard Symbols: GHS02;GHS07;GHS09 Warning
• Risk Statements: H226-H315-H319-H335-H411
• Safety Statements: P210-P233-P240-P241-P242-P243-P261-P264-P264+P265-P271-P273-P280-P302+P352-P303+P361+P353-P304+P340-P305+P351+P338-P319-P321-P332+P317-P337+P317-P362+P364-P370+P378-P391-P403+P233-P403+P235-P405-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Specific target organ toxicity - single exposure	STOT SE	3	H335
Flammable liquids	Flam. Liq.	3	H226
Acute toxicity	Acute Tox.	3	H301
Acute toxicity	Acute Tox.	3	H331
Reproductive toxicity	Repr.	2	H361
Acute toxicity	Acute Tox.	3	H311
Chronic hazardous to the aquatic environment	Aquatic Chronic	4	H413

Discovery and Applications

Triethoxyoctylsilane is an organosilicon compound that has gained attention for its versatile applications in various fields, including materials science, surface modification, and construction. This compound features an octyl group attached to a silicon atom, which is further bonded to three ethoxy groups. The discovery of triethoxyoctylsilane can be traced back to the exploration of silane chemistry in the late 20th century, which aimed to harness the unique properties of silicon-based compounds for practical applications.

The synthesis of triethoxyoctylsilane involves the reaction of octyltrichlorosilane with ethanol, leading to the formation of the ethoxy-functionalized silane. This process allows for the introduction of the octyl group, which imparts hydrophobic characteristics to the compound. Researchers and industrial chemists have long recognized the potential of silanes in enhancing the performance of materials, particularly their ability to promote adhesion, improve moisture resistance, and modify surface properties.

One of the primary applications of triethoxyoctylsilane is in surface modification. The compound is widely used to treat various substrates, including glass, metals, and polymers. When applied, triethoxyoctylsilane forms a monolayer on the surface, enhancing its hydrophobicity and chemical stability. This modification is particularly beneficial in applications where water resistance is crucial, such as in coatings, sealants, and adhesives. By improving the surface properties, triethoxyoctylsilane helps to enhance the durability and longevity of these materials in challenging environments.

In the field of construction, triethoxyoctylsilane is employed as a water-repellent agent in masonry and concrete treatments. Its ability to penetrate porous materials and form a protective barrier against moisture ingress makes it an invaluable component in waterproofing applications. By preventing water penetration, triethoxyoctylsilane helps to mitigate issues related to efflorescence, freeze-thaw damage, and mold growth. This property is particularly important in regions with high humidity or frequent rainfall, where building materials are at risk of deterioration due to moisture exposure.

Additionally, triethoxyoctylsilane is used in the formulation of silicone-based sealants and adhesives. Its incorporation into these products enhances their adhesion to various substrates, providing improved bonding strength and durability. This application is vital in automotive, aerospace, and construction industries, where reliable adhesion is essential for structural integrity and performance.

In the realm of composites, triethoxyoctylsilane serves as a coupling agent, promoting the bonding between inorganic fillers and organic matrices. This application is particularly significant in the production of polymer composites, where the compatibility of different materials can greatly influence the overall performance of the composite. By enhancing the interface between the filler and the matrix, triethoxyoctylsilane improves mechanical properties, thermal stability, and resistance to environmental factors.

Moreover, triethoxyoctylsilane has been explored for its potential in biomedical applications. Its biocompatibility and ability to modify surfaces make it suitable for creating hydrophobic coatings on medical devices and implants. This modification can enhance the device's performance and reduce the risk of bacterial adhesion, thereby improving the overall efficacy of the medical product.

While triethoxyoctylsilane exhibits numerous beneficial properties, it is essential to consider environmental and safety aspects associated with its use. Regulatory agencies continuously evaluate the safety profiles of chemical substances, including silanes, to ensure they are used responsibly. Proper handling and disposal procedures must be implemented to mitigate any potential risks to human health and the environment.

In summary, triethoxyoctylsilane is a versatile organosilicon compound with significant applications in surface modification, construction, adhesives, and biomedical fields. Its ability to enhance hydrophobicity, adhesion, and durability makes it a valuable component across various industries. As research continues to advance, triethoxyoctylsilane remains a crucial player in the development of high-performance materials and products designed to withstand challenging environments.

References

2024. A critical review on the effect of silanization on the ceramic membrane distillation (CMD): performance, operational factors, and characterization, _Applied Water Science_, 14(5)
DOI: https://doi.org/10.1007/s13201-024-02178-3

2023, One-step synthesis of polymethylhydrosiloxane-silver nanocomposite multifunctional superhydrophobic cotton fabrics, _Cellulose_, 30(8)
DOI: https://doi.org/10.1007/s10570-023-05245-1

2023, Improving performance of natural rubber composites by the application of functional biofiller: horsetail modified with silane coupling agents, _Cellulose_, 30(16)
DOI: https://doi.org/10.1007/s10570-023-05505-0