Polyalkyleneoxide modified heptamethyltrisiloxane
[CAS# 27306-78-1]

Identification

• Classification: Chemical reagent >> Organic reagent >> Siloxane
• Name: Polyalkyleneoxide modified heptamethyltrisiloxane
• Synonyms: 3-[Methoxypoly(ethoxy)]propyl-methyl-bis(trimethylsilyloxy)silane; Polyethyleneglycols methyl 3-[1,3,3,3-tetramethyl-1-(trimethylsiloxy) disiloxanyl]propyl ether
• Molecular Formula: (C₂H₄O)_n.C₁₁H₃₀O₃Si₃
• CAS Registry Number: 27306-78-1
• EC Number: 608-078-3
• SMILES: COCCOCCC[Si](C)(O[Si](C)(C)C)O[Si](C)(C)C

Properties

• Density: 0.9±0.1 g/cm³, Calc.^*
• Index of Refraction: 1.422, Calc.^*
• Boiling Point: 307.7±48.0 °C (760 mmHg), Calc.^*
• Flash Point: 122.2±30.0 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS07;GHS09 Warning
• Risk Statements: H302-H312-H315-H319-H332-H411
• Safety Statements: P261-P264-P264+P265-P270-P271-P273-P280-P301+P317-P302+P352-P304+P340-P305+P351+P338-P317-P321-P330-P332+P317-P337+P317-P362+P364-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Acute toxicity	Acute Tox.	4	H332
Acute toxicity	Acute Tox.	4	H302
Acute toxicity	Acute Tox.	4	H312
Skin irritation	Skin Irrit.	2	H315
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Specific target organ toxicity - repeated exposure	STOT RE	2	H373
Serious eye damage	Eye Dam.	1	H318

Discovery and Applications

Polyalkyleneoxide modified heptamethyltrisiloxane is a compound that belongs to the class of organosilicon compounds. It is formed by attaching polyalkylene oxide chains to a heptamethyltrisiloxane backbone, which is a type of siloxane. This unique structure gives the substance both hydrophobic and hydrophilic properties, making it highly versatile for various applications in the fields of industrial chemistry, materials science, and personal care products.

The discovery of polyalkyleneoxide modified heptamethyltrisiloxane is linked to the ongoing research in the field of silicone chemistry. Heptamethyltrisiloxane, a simple siloxane compound, has been studied for its ability to form stable and flexible bonds. The modification with polyalkylene oxide segments further improves its properties by enhancing solubility in water and compatibility with other organic compounds. This modification process was developed over several decades, with early efforts focusing on improving the properties of silicones for use in diverse applications.

One of the most notable applications of polyalkyleneoxide modified heptamethyltrisiloxane is in personal care products. It is commonly used in cosmetics, particularly in skin and hair care formulations. The substance acts as an emulsifier, helping to blend oil and water-based ingredients effectively. It is also used to improve the spreadability and texture of products, such as lotions, shampoos, and conditioners. The hydrophobic siloxane backbone provides a smooth, silky feel to the skin and hair, while the polyalkylene oxide chains contribute to moisture retention and enhanced product performance.

In addition to personal care, polyalkyleneoxide modified heptamethyltrisiloxane is widely used in industrial applications, particularly in the formulation of lubricants and defoamers. The substance's ability to reduce surface tension makes it an effective defoaming agent, particularly in water-based systems. It helps to prevent the formation of foam during manufacturing processes in industries such as paper, textiles, and food production. Furthermore, it is used as a lubricant additive in various mechanical systems, where it helps to reduce friction and wear between moving parts.

Polyalkyleneoxide modified heptamethyltrisiloxane also finds application in the agricultural industry. It is used in some pesticide formulations to improve the spreading and adhesion of the chemicals on plant surfaces. The unique chemical properties of the compound allow it to enhance the effectiveness of pesticides by ensuring more uniform coverage and improving absorption into plant tissues.

Overall, polyalkyleneoxide modified heptamethyltrisiloxane is a versatile chemical substance that is integral to a wide range of industries, from personal care to manufacturing and agriculture. Its ability to combine hydrophilic and hydrophobic properties in a single molecule makes it an indispensable tool in the development of high-performance formulations and products.

References

Compound: Polyethylene glycol monomethyl ether mono[3-[methylbis(trimethylsiloxy)silyl]propyl] ether.