Vinyl & Methacrylate Silanes for Plastics & Polymers

Overview

Vinyl and methacrylate silanes are coupling and crosslinking agents that carry ancarbon-carbon double bond on the organic end and a hydrolyzable alkoxysilane on thenother. The silane end bonds to glass, silica, and mineral fillers; the unsaturatednend takes part in free-radical or peroxide reactions. The two sub-classes are notninterchangeable: vinyl silanes graft onto polyethylene and couple to unsaturated polyester,nwhile the methacrylate silane copolymerizes readily into acrylic and unsaturated polyesternresins.

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For moisture-cure polyethylene (Sioplas and Monosil pipe and wire/cable), the vinylnsilane is grafted to the backbone and later crosslinks through hydrolysis and condensation.nLeaving group sets the cure: vinyltrimethoxysilane hydrolyzes fastest but releasesnmethanol; vinyltriethoxysilane is slower and releases ethanol; vinyltris(2-methoxyethoxy)nsilane is slower still and less volatile, which suits controlled cure in cable compounds.nMatch the grade to your line speed and ventilation.

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The methacrylate silane (3-methacryloxypropyltrimethoxysilane) is the one to specify whennthe resin itself is acrylic or unsaturated polyester, because its methacrylate groupncopolymerizes into that network rather than only grafting. It is the standard coupling agentnfor glass-reinforced polyester and vinyl-ester composites and for filled acrylic systems.nTreat fillers at roughly 0.5 to 1% on weight and confirm peroxide or radical-initiatorncompatibility with your cure.

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Recommended Chemistries

5 materials

3-Methacryloxypropylmethyldimethoxysilane (MPDMS)

CAS 14513-34-9

Coupling / Adhesion Promotion Quick view

3-Methacryloxypropyltrimethoxysilane (MPTMS)

CAS 2530-85-0

Methacrylate silane coupling agent Quick view

Vinyltriethoxysilane (VTES)

CAS 78-08-0

Vinyl silane (ethoxy) Quick view

Vinyltrimethoxysilane (VTMS)

CAS 2768-02-7

Vinyl silane u2014 PE crosslinking (methoxy) Quick view

Vinyltris(2-Methoxyethoxy)Silane

CAS 1067-53-4

Vinyl silane u2014 low-volatility, controlled cure Quick view

Where it's used

Moisture-crosslinking of polyethylene for pipe and wire/cable (Sioplas, Monosil)
Coupling agent for glass-reinforced unsaturated polyester and vinyl-ester (FRP) composites
Adhesion and crosslinking additive in acrylic and filled acrylic systems
Filler and glass surface treatment to improve wet-strength retention
Reactive silane for peroxide-cure and radical-cure compound systems

Frequently asked questions

What is the difference between vinyl and methacrylate silanes?

Both are reactive silanes with a hydrolyzable alkoxysilane end that bonds to glass and fillers; they differ in the organic double bond. Vinyl silanes carry a plain vinyl group that grafts onto polyethylene and couples to unsaturated polyester. The methacrylate silane carries a methacrylate group that copolymerizes directly into acrylic and unsaturated polyester resins. They are not interchangeable u2014 pick by the resin chemistry you are coupling to.

Which silane is used for crosslinking polyethylene?

Vinyl silanes are used to moisture-crosslink polyethylene in the Sioplas and Monosil processes for pipe and wire/cable. The silane is grafted to the PE backbone and later crosslinks through hydrolysis and condensation. Vinyltrimethoxysilane cures fastest (methanol byproduct); vinyltriethoxysilane is slower (ethanol); vinyltris(2-methoxyethoxy)silane is slower and less volatile for controlled cure in cable compounds.

Which silane should I use with unsaturated polyester or acrylic resin?

For unsaturated polyester, vinyl-ester, and acrylic systems, specify 3-methacryloxypropyltrimethoxysilane. Its methacrylate group copolymerizes into the resin network during radical or peroxide cure, so the coupling agent is built into the matrix rather than only adhering at the surface. It is the standard coupling agent for glass-reinforced polyester (FRP) and filled acrylic systems.

Does RawSource supply vinyl and methacrylate silanes in bulk?

Yes. RawSource sources VTMS, VTES, VTMOEO, and the methacrylate silane in bulk quantities u2014 drums, totes, and IBCs u2014 with CAS identification and documentation. Submit a bulk RFQ with your grade, volume, and target application and the plastics and polymers desk will quote sourcing.

References

Disclaimer. Information on this page is provided for general reference and compiled from authoritative public sources (e.g. PubChem/ECHA). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot you purchase governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim. Always consult the current Safety Data Sheet (SDS) before handling, and confirm regulatory status, classification, and suitability for your application and jurisdiction.

Vinyl & Methacrylate Silanes

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