Poly(dimethylsiloxane) hydride terminated
[CAS# 70900-21-9]

Identification

• Classification: Chemical reagent >> Organic reagent >> Siloxane
• Name: Poly(dimethylsiloxane) hydride terminated
• Synonyms: Polysiloxanes di-Me hydrogen-terminated; Di-Me-Siloxanes and Silicones hydrogen-terminated
• Molecular Weight: ~580
• CAS Registry Number: 70900-21-9
• EC Number: 615-197-4
• SMILES: C[SiH](C)O[Si](C)(C)O[SiH](C)C

Properties

• Density: 0.93 g/mL (25 ºC)
• Boiling point: 230 ºC
• Refractive index: 1.397
• Flash point: 112.8 ºC (closed cup)

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
Eye irritation	Eye Irrit.	2	H319
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Flammable liquids	Flam. Liq.	3	H226
Reproductive toxicity	Repr.	2	H361
Flammable liquids	Flam. Liq.	2	H225

Discovory and Applicatios

Poly(dimethylsiloxane) hydride terminated (PDMS hydride terminated) is a type of silicone polymer with unique properties and a wide range of applications. This substance consists of a polymeric backbone made up of repeating siloxane (Si–O) units, with hydride groups (-H) attached to the terminal ends of the polymer chain. These hydride-terminated PDMS materials are highly valued for their flexibility, stability, and ability to undergo further chemical modifications, which contribute to their use in various industries.

The discovery of PDMS can be traced back to the early 20th century, when researchers, including scientists from Dow Corning, recognized the potential of silicone-based compounds. However, it wasn’t until later that hydride-terminated variants of poly(dimethylsiloxane) were synthesized, enabling further functionalization and enhancing their versatility. The incorporation of hydride groups at the polymer ends allows PDMS to react with other chemicals and undergo crosslinking reactions, offering unique benefits over other types of silicones.

One of the main applications of PDMS hydride terminated is in the formulation of sealants and adhesives. The presence of hydride groups allows the polymer to react with silane-based crosslinking agents, resulting in highly durable and flexible materials. These adhesives and sealants are particularly useful in industries like construction, automotive, and aerospace, where they are used for sealing joints, bonding materials, and protecting surfaces from environmental stress. They are known for their excellent resistance to extreme temperatures, moisture, and aging, making them reliable in challenging conditions.

In the medical field, PDMS hydride-terminated polymers are used in a variety of applications due to their biocompatibility, flexibility, and ease of modification. These polymers can be used in the manufacturing of medical devices such as implants, tubing, and wound dressings. The hydride groups can be utilized to incorporate functional groups, such as antimicrobial agents or drug delivery systems, which enhance the therapeutic properties of the materials. Their ability to remain stable and inert in contact with human tissue makes them a popular choice for medical-grade materials.

PDMS hydride-terminated compounds also have significant uses in the electronics industry. Due to their excellent insulating properties, they are used as coatings for electronic components, such as circuit boards and sensors. The hydride groups allow for easy incorporation of functional groups that can improve adhesion to substrates, enhance thermal conductivity, or provide additional protection from environmental factors like humidity or dust. This makes PDMS hydride-terminated polymers essential in the production of long-lasting and reliable electronic devices.

Another application of PDMS hydride terminated is in the cosmetic and personal care industry. Their use in hair care products, skin creams, and lotions is largely due to the unique properties of PDMS, which imparts a smooth, non-greasy texture to formulations. The hydride-terminated version can also be modified to add moisturizing or conditioning agents, making these products more effective in treating skin and hair. The hydrophobic nature of the polymer ensures that it resists water, thus helping in the development of products that require durability and long-lasting effects.

In addition, PDMS hydride-terminated materials are used in the field of nanotechnology and advanced materials. These polymers can be functionalized with various chemical groups to create materials with specialized properties such as increased strength, conductivity, or chemical reactivity. For example, PDMS hydride-terminated compounds can be used in the fabrication of nanoparticles or nanocomposites, which are critical for applications in sensors, drug delivery systems, and high-performance coatings.

The versatility of PDMS hydride-terminated polymers lies in their ability to undergo chemical reactions with various functional groups, making them suitable for customization according to specific requirements. They can be combined with other materials or crosslinked to enhance their mechanical properties, electrical conductivity, or resistance to environmental factors. As a result, PDMS hydride-terminated polymers continue to be an essential component in many high-performance applications.

In conclusion, poly(dimethylsiloxane) hydride-terminated polymers are highly versatile materials with a wide range of applications across multiple industries. Their flexibility, stability, and ability to undergo further modification make them essential in the development of adhesives, sealants, medical devices, electronics, and more. Ongoing research into their properties and potential uses continues to drive innovation and expand their scope in various technological fields.