Description

1-Ethenyl-9,9,9-Trimethoxy-1,1,3,3,5,5,7,7-Octamethylpentasiloxane is a specialized organosilicon compound featuring a unique hybrid structure of vinyl and methoxy functionalities on a pentasiloxane backbone. This molecular architecture makes it a highly versatile reactive intermediate and cross-linking agent for advanced silicone polymers. It is essential for manufacturers seeking to develop materials with tailored surface properties, enhanced adhesion, and controlled reactivity. Key industries that utilize this compound include advanced silicone elastomers, release coatings, and high-performance adhesives and sealants.

Application

• Cross-linking Agent for Silicone Elastomers: Used to introduce reactive vinyl and methoxy sites into silicone networks, enhancing cure properties and final material performance.
• Intermediate for Specialty Silicone Fluids & Resins: Serves as a key building block in the synthesis of custom silicone copolymers with modified surface energy and reactivity.
• Adhesion Promoter in Sealants and Adhesives: Improves bonding between silicone materials and various substrates, including metals, plastics, and glass.
• Surface Modification Agent: Used to functionalize inorganic fillers (like silica) or surfaces to improve compatibility within silicone matrices.
• Release Coating Formulations: Imparts controlled release characteristics in paper and film coatings for pressure-sensitive adhesive applications.
• Precursor for Hybrid Organic-Inorganic Materials (ORMOSILs): A critical component in sol-gel processes to create materials with combined properties of glass and organic polymers.

Basic Information

Product Name	1-Ethenyl-9,9,9-Trimethoxy-1,1,3,3,5,5,7,7-Octamethylpentasiloxane
CAS No.	144739-99-1
Molecular Formula	C14H40O8Si5
Molecular Weight	509.0 g/mol
Synonyms	Vinyltrimethoxypentasiloxane; 1-Vinyl-9,9,9-trimethoxy-1,1,3,3,5,5,7,7-octamethylpentasiloxane; Vinyl T Methoxy Pentasiloxane; Octamethyl-1-vinyl-9,9,9-trimethoxypentasiloxane; Reactive Methoxy-Vinyl Siloxane; Silane, ethenyl[3,3,5,5,7,7-hexamethyl-9,9,9-trimethoxy-1,1-dioxo-2,4,6,8,10-pentaoxa-3,5,7,9-tetrasilaundecyl]oxy]-; A compound of Methoxy and Vinyl functionalized linear pentasiloxane.
EINECS	Contact for details

Quality Control

Our production of 1-Ethenyl-9,9,9-Trimethoxy-1,1,3,3,5,5,7,7-Octamethylpentasiloxane adheres to a stringent quality management system to ensure batch-to-batch consistency and reliability. All materials undergo rigorous analytical testing, including assay by GC or NMR, and verification of functional group content. Certificates of Analysis (COA) detailing purity, identity, and key physical parameters are provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Ensure containers are kept tightly sealed when not in use to prevent degradation from atmospheric moisture. Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms to structure
Assay (GC or 1H-NMR)	≥ 95.0%
Methoxy Content (OCH3)	Contact for details
Vinyl Content (CH2=CH-)	Contact for details
Water Content (Karl Fischer)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.