18724-32-8

Basic information

• Product Name: 1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE
• Synonyms: 1,1,3,3-tetramethyl-1,3-bis[2-[7-oxabicyclo[4.1.0]hept-3-yl]ethyl]-Disiloxane;1,3-bis-[2-(3,4-epoxy-cyclohexyl)-ethyl]-1,1,3,3-tetramethyl-disiloxane;BIS2-[3,4-(EPOXYCYCLOHEXYL)ETHYL]TETRAMETHYLDISILOXANE;1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE;Bisepoxycyclohexylethyltetramethyldisiloxane;Disiloxane,1,1,3,3-tetramethyl-1,3-bis[2-[7-oxabicyclo[4.1.0]hept-3-yl]ethyl]-;1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-;1,3-BIS[2-(3,4-EPOXYCYCLOHEXYL)ETHYL]TETRAMETHYLDISILOXANE, 90%
• CAS NO: 18724-32-8
• Molecular Formula: C₂₀H₃₈O₃Si₂
• Molecular Weight: 382.68
• EINECS: 204-803-9
• Mol File: 18724-32-8.mol
• Article Data: 6

Chemical Properties

• Melting Point: -40°C
• Boiling Point: 400.612 °C at 760 mmHg
• Flash Point: 200°C
• Appearance: /
• Density: 0,997 g/cm3
• Vapor Pressure: 0mmHg at 25°C
• Refractive Index: 1.481
• Storage Temp.: Inert atmosphere,Store in freezer, under -20°C
• CAS DataBase Reference: 1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE(18724-32-8)
• EPA Substance Registry System: 1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE(18724-32-8)

Safety Data

• Statements: 36/37/38
• Safety Statements: 26-36/37/39-45
• TSCA: No
• Hazardous Substances Data: 18724-32-8(Hazardous Substances Data)

Usage

General Description

1,3 BIS[2(3,4 EPOXYCYCLOHEX-1-YL)ETHYL]TETRA-METHYLDISILOXANE is a chemical compound with the molecular formula C18H38O2Si2. It is a type of siloxane, which is a group of chemical compounds containing silicon, oxygen, and carbon atoms. This specific compound contains two epoxy groups and four methyl groups, as well as two cyclohexyl moieties. It is commonly used as a cross-linking and coupling agent in various industrial processes, such as in the production of coatings, adhesives, and sealants. Additionally, it can be used as a building block in the synthesis of more complex organosilicon compounds and materials. Its unique structure and properties make it valuable in a range of applications in the chemical industry.

InChI:InChI=1/C20H38O3Si2/c1-24(2,11-9-15-5-7-17-19(13-15)21-17)23-25(3,4)12-10-16-6-8-18-20(14-16)22-18/h15-20H,5-14H2,1-4H3

Upstream product

• 106-86-5 1,2-Epoxy-4-vinylcyclohexane 
• 3277-26-7 1,1,3,3-Tetramethyldisiloxane 

Relevant articles and documents

Synthesis, characterization, and photocuring of siloxane-oxirane monomers

The aim of this study was to synthesize, characterize, and evaluate alternative monomers for use in dentistry. Three siloxane-oxirane low-shrinkage monomers were synthesized, and the products' conversion was followed by Fourier transform-infrared spectroscopy. The products obtained were characterized by 1H and 13C NMR and evaluated for viscosity and a refractive index. The polymerization was evaluated by formulating two experimental photoinitiation systems, which varied for the presence of 1,2 ethanediol. A ternary system with camphorquinone (CQ), ethyl 4-dimethylaminobenzoate (EDAB), and diphenyliodonium hexafluorphosphate (DPI) was used as control. The degree of conversion was assessed by differential scanning calorimetry (DSC). The NMR confirmed the synthesis success with 75, 87, and 55% yields for the monomers synthesized. The viscosity and the refractive index of the monomers showed favorable rheological and physical behaviors for application in dentistry. Moreover, the presence of 1,2-ethanediol increased the degree of conversion of the siloxane-oxirane monomers. This study showed a simple and effective way to synthesize siloxane-oxirane monomers with a high potential for application in dental materials.

Microwave synthesis method of 1,3-bis[2-(3, 4-epoxycyclohexyl)ethyl]tetramethyldisiloxane

The invention discloses a microwave synthesis method of 1,3-bis[2-(3,4-epoxycyclohexyl)ethyl]tetramethyldisiloxane. The synthesis method comprises the following steps: (1) under the protection of inert gas, sequentially adding tetramethyldisiloxane, an organic solvent and 4-vinyl-1,2-epoxy cyclohexene into a reaction flask, stirring the reaction liquid, then adding a supported Pt/Y molecular sievecatalyst, finally adding absolute ethyl alcohol, and continuously stirring the reaction liquid to obtain a suspension; and (2) transferring the suspension into a microwave synthesis reactor for reaction, after the reaction is finished, reducing the pressure of the reaction liquid to remove the solvent and low-boiling-point substances, and then carrying out centrifugal separation to obtain the 1,3-bis [2-(3,4-epoxycyclohexyl)ethyl]tetramethyldisiloxane. The method has the advantages of mild reaction conditions, short reaction time, high raw material active hydrogen conversion rate, excellent activity and stability of the catalyst, recyclability, cost reduction, high yield of the prepared target product, and good industrialization prospect.

Stable, cationically polymerizable/crosslinkable dental compositions having high filler contents

Stable, highly filled cationic dental compositions useful for the production of dental prostheses and dental restoration materials contain: (1) at least one compound which is reactive cationically when activated, advantageously at least one UV-and cationically reactive oxirane-functionalized silicone; (2) at least one dental filler, advantageously SiO2; (3) at least one organic polymer or copolymer dispersant having an amine index less than or equal to 100 mg of potassium hydroxide per gram of dispersant, advantageously a polyurethane/acrylate copolymer or alkylammonium salt thereof; (4) at least one cationic photoinitiator, advantageously iodonium borate; and (5) optionally, at least one photosensitizer.