Dynasylan® VTMO

Dynasylan® VTMO is a bifunctional organosilane possessing a reactive vinyl group and a hydrolyzable inorganic trimethoxysilyl group. The dual nature of its reactivity allows Dynasylan® VTMO to bind chemically to both inorganic materials (e.g. glass, metals, fillers) and organic polymers (e.g. thermosets, thermoplastics, elastomers), thus functioning as a crosslinking agent, adhesion promoter and/or surface modifier. Dynasylan® VTMO is a colorless, low-viscosity liquid with a typical aromatic odor.

Principal: Evonik Corporation Silanes

Functions: Adhesion Promoter, Co-Monomer, Coupling Agent, Crosslinking Agent, Moisture Scavenger, Surface Modifier

Chemical Name: Vinyltrimethoxysilane

Chemical Family: Organosilane

End Uses: Cable Insulation, Ceramic Coating, Ceramics, Glass, Pipes, Wire & Cable Sheath

Compatible Polymers & Resins: Polyethylenes (PE), Silicones

Applicable Processes: Ceramics Pre-Treatment, Glass Treatment, Metal Treatment

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Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Applicable Processes
Coating End Applications
Compatible Polymers & Resins
Compatible Substrates & Surfaces
Industrial Additives End Use
Plastics & Elastomers End Uses
Plastics & Elastomers Processing Methods
Markets
Applications
Product Applications
  • Moisture curing of polymers:
    • Dynasylan® VTMO is suitable for the preparation of moisture- curing polymers, e.g. polyethylene.
    • The characteristic feature of this process is peroxide-initiated grafting of the vinylsilane to the polymer during extrusion.
    • After grafting, the polymer can still be processed as a thermoplast.
    • Only upon treatment with moisture (in a 80-100 °C waterbath, steambath, or even at ambient conditions), the polymer chains are linked together; thereby forming a crosslinked polymer.
    • This reaction can be accelerated by using a catalyst.
    • Silane crosslinked polyethylene is widely used as cable isolation, and sheathing mainly in low voltage applications as well as for hot water/sanitary pipes and underfloor heating.
    • Heat resistance is the main reason for the crosslinking of polymers for cable applications, but crosslinking can also improve the following properties: tear- and crack resistance, chemical resistance, abrasion resistance, memory effect.
    • Dynasylan® VTMO may also be used as a co-monomer for the preparation of different polymers such as polyethylene or acrylics.
    • Those polymers show an improved adhesion to inorganic surfaces and they can also be crosslinked with moisture as described above.
  • Adhesion promotion and surface modification:
    • Because of its ability to react with inorganic fillers as well as with organic polymers (activated by e.g. peroxides or radiation), Dynasylan® VTMO acts as an efficient adhesion
    • promoter for various mineral-filled polymers, improving mechanical and electrical properties especially after exposure to moisture.
    • Once bonded to an inorganic filler, Dynasylan® VTMO hydrophobates the filler surface, improving the compatibility of fillers with polymers, leading to a better dispersibility, reduced melt viscosity and easier processing of filled plastics.
    • The pretreatment of glass, metals, or ceramic surfaces with Dynasylan® VTMO improves the adhesion of coatings on these surfaces and can thus improve the corrosion resistance.
  • Dynasylan® VTMO as co-monomer for polymer dispersions
    • Polymer dispersions (e.g. styrene acrylics), modified with Dynasylan® VTMO show improved adhesion strenght in wet conditions and wet scrub resistance.
  • Dynasylan® VTMO as moisture scavenger
    • Dynasylan® VTMO reacts rapidly with water. Even traces of water can be removed with Dynasylan® VTMO.
    • This effect is used widely in sealants.
  • Other applications of Dynasylan® VTMO:
    • Dynasylan® VTMO can easily bond to OH-groups. Hydroxyl containing polymers e.g. functionalized silicones, may be modified with Dynasylan® VTMO, thereby introducing reactive
    • vinyl groups into the polymer chains.
    • The vinyl group of Dynasylan® VTMO is activated by its proximity to silicon, which makes it an attractive molecule for different organic syntheses.

Properties

Product Reactivity
  • In the presence of moisture the methoxy (Si-OCH₃) groups of Dynasylan® VTMO hydrolyze to produce methanol and reactive silanol (Si-OH) groups which can bond to a variety of inorganic substrates or react with each other to form siloxane bonds (Si- O-Si).
  • The organophilic vinyl end of Dynasylan® VTMO can also react with a suitable polymer initiated by a peroxide.

Regulatory & Compliance

Packaging & Availability

Packaging Type
Product Packaging
  • Dynasylan® VTMO is supplied in 25 kg or 195 kg drums or 900 kg containers.

Storage & Handling

Storage Conditions
  • The containers must remain tightly sealed during storage and kept in a cool, well aired place.
  • The product should be protected against humidity.
  • In the unopened container the shelf life of Dynasylan® VTMO is min. 12 months from delivery.

Other

Appearance
Colorless low ­viscosity liquid
Boiling Point
123.0 °C
Boiling Point (SDS)
123.0 °C
Color (SDS)
Colorless
Decomposition Temperature (SDS)
min. 253.0 °F
Density
0.97 g/cm³
Density (SDS)
0.97 g/cm³
Flash Point
25.0 °C
Flash Point (SDS)
25.0 °C
Freeze Point (SDS)
-143.0 °F
IATA/ICAO Emergency Response Guide
3L
IATA/ICAO Proper Shipping Name
Flammable liquid, N.O.S.
IATA/ICAO UN Number
UN 1993
IMO/IMDG EmS Fire
F-E
IMO/IMDG EmS Spill
S-E
IMO/IMDG Proper Shipping Name
Flammable liquid, N.O.S.
IMO/IMDG UN Number
UN 1993
Ignition Temperature (SDS)
235.0 °C
Immiscible In (SDS)
Water
Item Number
Lower Explosive Limit (SDS)
1.4 %(V/V)
Odor
Typical aromatic odor
Odor (SDS)
Fruity
Other Hazards
None.
Partition coefficient n-octanol/water (SDS)
1.1-2.0
Principal
Refractive Index
1.39
Self Ignition Temperature (SDS)
435.0 °F
Shelf Life
12.0 mo
USA/DOT Emergency Response Guide Number
128
USA/DOT Proper Shipping Name
Flammable liquids, N.O.S.
USA/DOT UN Number
UN 1993
Upper Explosion Limit (SDS)
23.94 %(V/V)
Vapor Pressure (SDS)
88.0 hPa
Vapor Pressure (SDS)
12.0 hPa
Viscosity
1.0 mPa.s
Viscosity (SDS)
1.0 mPa.s
Optical Properties
ValueUnitsTest Method / Conditions
Refractive Index1.39-DIN 51423 nD20
Shelf Life & Stability
ValueUnitsTest Method / Conditions
Shelf Life12.0 momo
Physical Properties
ValueUnitsTest Method / Conditions
Boiling Point123.0 °C°CDIN 51751 at 1013 hPa
Density0.97 g/cm³g/cm³DIN 51757 At 20°C
Flash Point25.0 °C°CDIN 51755
Viscosity1.0 mPa.smPa.sDIN 53015 At 20°C
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Boiling Point (SDS)123.0 °C°CDIN 51751 at 1013 hPa
Decomposition Temperature (SDS)min. 253.0 °F°F
Density (SDS)0.97 g/cm³g/cm³DIN 51757 at 20°C
Flash Point (SDS)25.0 °C°CDIN EN ISO 13736
Freeze Point (SDS)-143.0 °F°F
Ignition Temperature (SDS)235.0 °C°CDIN 51794
Lower Explosive Limit (SDS)1.4 %(V/V)%(V/V)
Partition coefficient n-octanol/water (SDS)1.1-2.0-hydrolysis product, n- octanol/water
Self Ignition Temperature (SDS)435.0 °F°F
Upper Explosion Limit (SDS)23.94 %(V/V)%(V/V)
Vapor Pressure (SDS)88.0 hPahPaAt 50°C
Vapor Pressure (SDS)12.0 hPahPaat 20°C
Viscosity (SDS)1.0 mPa.smPa.sDIN 53015 at 20°C