Poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated
[CAS# 225927-21-9]

Identification

• Classification: Chemical reagent >> Organic reagent >> Siloxane
• Name: Poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated
• Synonyms: bis[[ethenyl(dimethyl)silyl]oxy]-dimethylsilane
• CAS Registry Number: 225927-21-9
• EC Number: 695-281-5
• SMILES: C[Si](C)(C=C)O[Si](C)(C)O[Si](C)(C)C=C

Properties

• Density: 0.9±0.1 g/cm³, Calc.^*
• Index of Refraction: 1.424, Calc.^*
• Boiling Point: 211.4±23.0 °C (760 mmHg), Calc.^*
• Flash Point: 71.8±23.0 °C, Calc.^*

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

Safety Data

• Hazard Symbols: GHS05 Danger
• Risk Statements: H318
• Safety Statements: P264+P265-P280-P305+P354+P338-P317

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Serious eye damage	Eye Dam.	1	H318

Discovery and Applications

Poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated is a versatile siloxane polymer used in a wide range of industrial and commercial applications due to its unique combination of properties. The polymer is a copolymer of methylphenylsiloxane, where the phenyl group contributes to its rigidity and aromaticity, and the methyl group enhances its flexibility and hydrophobicity. The termination of the polymer with ethenyldimethylsilyl groups imparts reactivity, making it an ideal candidate for further chemical modifications or cross-linking.

The discovery of poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated can be traced back to the exploration of functional siloxane polymers in the 20th century. Siloxanes, which are polymers composed of alternating silicon and oxygen atoms, exhibit remarkable thermal stability, low surface energy, and water repellency. The development of these polymers was initially driven by their utility in sealants, lubricants, and coatings. The incorporation of the ethenyldimethylsilyl group at the terminal position was a later development aimed at enhancing the reactivity of the polymer, thus broadening its applicability in diverse fields.

One major application of poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated is in the area of coatings and sealants. The polymer’s combination of flexibility, water repellency, and ability to form cross-linked structures makes it ideal for use in automotive, construction, and electronics industries. The ethenyldimethylsilyl termination facilitates the curing process, enabling the polymer to form robust networks that can withstand harsh environmental conditions, such as extreme temperatures and exposure to moisture. These properties make it especially useful for sealing joints, waterproofing applications, and producing coatings with enhanced durability.

In addition to its use in coatings and sealants, poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated has also found applications in the field of microelectronics. The polymer's ability to form thin, conformal coatings makes it ideal for use in semiconductor devices, where it can be employed as an insulating layer or as part of a protective coating. The ethenyldimethylsilyl groups allow for controlled chemical reactions during the manufacturing process, enabling precise functionalization of the polymer surface.

Poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated is also utilized in the field of personal care and cosmetics, where it acts as a conditioning agent and provides a smooth, non-greasy feel to formulations. The polymer’s low surface energy and ability to spread evenly on surfaces make it an attractive option for use in products like shampoos, conditioners, and skin care creams.

In conclusion, poly(methylphenylsiloxane) [(ethenyldimethylsilyl)oxy]terminated is a highly versatile polymer with applications spanning industries such as coatings, microelectronics, and personal care. Its combination of desirable physical properties, coupled with the ability to modify its reactivity through chemical termination, makes it a valuable material for a wide range of uses.

References

2017. Refractive index of 1,5-divinylhexamethyltrisiloxane. *Optical Constants*.
DOI: 10.1007/978-3-662-49236-9_43

2010. Functionalisation of Vinylsubstituted (Poly)Siloxanes and Silsesquioxanes via Cross-Metathesis and Silylative Coupling Transformations. *NATO Science for Peace and Security Series A: Chemistry and Biology*.
DOI: 10.1007/978-90-481-3433-5_12