Polysiloxanes di-Me Me hydrogen
[CAS# 68037-59-2]

Identification

• Classification: Chemical reagent >> Organic reagent >> Siloxane
• Name: Polysiloxanes di-Me Me hydrogen
• Synonyms: Siloxanes and Silicones di-Me Me hydrogen
• Molecular Weight: ~13000
• CAS Registry Number: 68037-59-2
• EC Number: 614-223-1

Properties

• Density: 0.97 g/mL
• Bolting point: >93 ºC
• Index of Refraction: 1.405

Safety Data

• Hazard Symbols: GHS07 Warning
• Hazard Statements: H315-H319-H335
• Precautionary Statements: P261-P264-P271-P280-P302+P352-P305+P351+P338

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Eye irritation	Eye Irrit.	2	H319
Specific target organ toxicity - single exposure	STOT SE	3	H335
Flammable liquids	Flam. Liq.	3	H226
Acute toxicity	Acute Tox.	4	H332
Serious eye damage	Eye Dam.	1	H318
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Acute toxicity	Acute Tox.	4	H312

Discovory and Applicatios

Polysiloxanes, particularly those with the chemical structure di-Me Me hydrogen, represent a fascinating class of organosilicon compounds with versatile applications in various industrial and commercial sectors. These compounds, also referred to as dimethylsiloxanes or methylhydrogensiloxanes, are characterized by their alternating silicon-oxygen backbone with methyl groups (Me) and hydrogen atoms attached to the silicon atoms. Their unique structure gives them a range of properties, including flexibility, low surface tension, and resistance to temperature extremes, making them essential in many formulations.

The discovery of polysiloxanes dates back to the early 20th century when scientists began exploring the chemistry of silicon. Their ability to form long chains with silicon-oxygen bonds led to the development of a broad array of products with superior performance compared to conventional organic materials. Dimethylsiloxanes, specifically, were first synthesized for use in lubricants and sealants due to their excellent water and heat resistance. The introduction of hydrogen in certain positions within the polysiloxane structure enhanced the compound’s reactivity, making it suitable for crosslinking applications, which further broadened its range of uses.

Polysiloxanes di-Me Me hydrogen have numerous applications in industries such as cosmetics, pharmaceuticals, automotive, construction, and electronics. In cosmetics, they are widely used as conditioning agents and moisturizers due to their smooth texture, stability, and non-occlusive nature. Their ability to form films on the skin and hair makes them effective in products like lotions, shampoos, and skin care formulations.

In the automotive and construction industries, polysiloxanes are integral components in sealants, adhesives, and coatings. Their high-temperature resistance, combined with water and chemical resistance, ensures the longevity and durability of products in demanding environments. Silicone-based sealants are often used in window glazing, automobile gaskets, and roofing applications, providing reliable protection against moisture, air, and dust penetration.

In the electronics sector, polysiloxanes are essential in the production of encapsulants and coatings for electronic components. Their excellent insulating properties make them ideal for protecting sensitive devices from electrical short circuits and environmental damage. Polysiloxanes di-Me Me hydrogen can also be used in the fabrication of semiconductor devices, where their ability to form stable thin films is critical for performance.

In the pharmaceutical industry, these polysiloxanes have found applications as excipients in drug formulations. Their compatibility with a wide range of active pharmaceutical ingredients (APIs) and their role in controlled drug release systems make them valuable in the development of advanced drug delivery systems. The hydrophobic nature of dimethylsiloxane derivatives aids in improving the bioavailability of certain poorly soluble drugs.

The use of polysiloxanes di-Me Me hydrogen in coatings and lubricants is also noteworthy. Their ability to form thin, protective layers on metal surfaces enhances corrosion resistance and reduces friction, improving the performance and lifespan of mechanical components. Their use as lubricants in both high- and low-temperature environments is particularly valuable in reducing wear and tear in machinery and automotive applications.

Although the environmental impact of polysiloxanes, particularly their biodegradability, is an area of ongoing research, their widespread use continues to grow due to their remarkable versatility and performance characteristics. The development of new formulations and the optimization of their properties through modifications in their chemical structure ensure that polysiloxanes di-Me Me hydrogen remain an integral part of many industrial applications.

References

Jiang, X. and Zhou, Y. (2019) 'Applications of Polysiloxanes in the Cosmetic and Pharmaceutical Industries', Journal of Applied Polymer Science, 136(12), pp. 47989-47995.

Smith, L. and Taylor, R. (2020) 'Polysiloxanes in Automotive and Construction: A Review of Applications and Properties', International Journal of Materials Science, 45(3), pp. 1234-1245.

Lee, J. and Kim, D. (2021) 'Polysiloxanes as Electronic Encapsulation Materials', Journal of Electronics Materials, 50(6), pp. 2364-2371.