Silanes for Polymer Crosslinking & Modification
Moisture-curable polyethylene crosslinking, sealant moisture scavenging, silane-terminated polyurethane synthesis, and reactive polymer intermediate chemistry.
Request Samples & TDSSilanes in this category are not coupling agents in the traditional sense — they do not bridge an inorganic surface to a polymer matrix. Instead, they become part of the polymer itself: grafted onto polyethylene chains to create moisture-curable crosslinks, consumed as moisture scavengers inside sealant formulations, or used as reactive end-cappers to create silane-terminated prepolymers that cure without isocyanate emission.
The largest-volume application is wire and cable insulation. Silane-crosslinked polyethylene (Si-XLPE) is manufactured by grafting a vinylsilane onto the PE chain using a peroxide initiator (the Sioplas or Monosil process), then exposing the cable to moisture and a catalyst to drive silanol condensation into Si-O-Si crosslinks. The result is a crosslinked insulation with improved thermal performance and resistance to deformation under electrical load — manufactured on standard extrusion equipment without the capital cost of electron beam or peroxide-cure lines.
In adhesive and sealant formulation, silanes serve two distinct roles. Vinylsilane (VTMO) consumes residual moisture from fillers and plasticizers before it can trigger premature crosslinking of the silyl-terminated polymer backbone. Isocyanatopropylsilane (ICPTES) end-caps hydroxyl-functional polyether or polyester prepolymers to produce silane-terminated polyurethane (STPU) adhesives — moisture-curing one-component systems that combine polyurethane mechanical properties with the regulatory advantage of zero isocyanate emission during application.
VTMO(Vinyltrimethoxysilane)
CAS 2768-02-7China: A-171
Vinylsilane for polyethylene crosslinking and sealant moisture scavenging. In wire and cable manufacturing, VTMO is grafted onto polyethylene chains through peroxide-initiated radical addition, creating pendant trimethoxysilyl groups that subsequently hydrolyze and condense in the presence of moisture and catalyst. The trimethoxy functionality provides rapid crosslinking kinetics suited to continuous extrusion and in-line moisture cure processes. In MS polymer sealant formulations, VTMO serves as a moisture scavenger — its alkoxysilane groups react with residual water from fillers and plasticizers, consuming moisture that would otherwise trigger premature crosslinking of the silyl-terminated polymer backbone. Silantek uses its own VTMO production internally for this purpose, providing direct formulation insight that informs product specifications and handling recommendations for customers.
Silane-crosslinked PE insulation (Sioplas and Monosil processes), moisture scavenger in sealant and adhesive formulations, polymer grafting and modification. Key industries: wire and cable manufacturing, adhesives and sealants.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →VTES(Vinyltriethoxysilane)
CAS 78-08-0China: A-151
Slower-hydrolysis vinylsilane for cable compound manufacturers who need extended processing windows. The triethoxy groups hydrolyze more slowly than the trimethoxy groups on VTMO, providing longer scorch time during extrusion — critical in medium-voltage cable insulation and thicker-walled constructions where premature crosslinking during extrusion causes surface defects, void formation, and reduced dielectric performance. The trade-off is slower post-extrusion moisture cure, which extends the time from extrusion to full crosslink density.
Silane-crosslinked PE insulation for medium-voltage cable, cable compounds requiring extended scorch safety, applications where controlled crosslinking profile is more important than cure speed.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →ICPTES(3-Isocyanatopropyltriethoxysilane)New
CAS 24801-88-5
Isocyanate-functional silane for silane-terminated polyurethane (STPU) prepolymer synthesis and hybrid polymer modification. The isocyanate group (-NCO) reacts with hydroxyl, amine, and thiol functionalities to form urethane, urea, and thiourethane linkages, while the triethoxysilyl group provides moisture-cure crosslinking. This dual reactivity makes ICPTES the key building block for a class of adhesives and sealants that combine polyurethane mechanical properties with silane crosslinking — curing without isocyanate emission during application. The practical significance is regulatory: as REACH diisocyanate restrictions tighten across Europe, STPU systems produced with ICPTES provide an isocyanate-free end product.
Silane-terminated polyurethane prepolymer synthesis, hybrid adhesive and coating formulation, dual-cure coating systems, polyurethane-to-glass and polyurethane-to-metal coupling, surface primer for inorganic substrates in PU bonding. Key industries: adhesives and sealants, hybrid polymer manufacturing, automotive and construction coatings.
Packaging: 200 kg steel drums, 1,000 kg IBC totes. Moisture-sensitive — shipped under nitrogen blanket.
Request Specifications →CPTMS(3-Chloropropyltrimethoxysilane)New
CAS 2530-87-2
Chloroalkyl-functional silane serving as a reactive intermediate for downstream synthesis. The chloro group undergoes nucleophilic substitution with amines, thiols, phosphines, and other nucleophiles, enabling production of quaternary ammonium silanes (antimicrobial surface coatings), phosphonium-functional silanes, and specialty derivatives that cannot be economically manufactured by direct hydrosilylation. The largest commercial downstream application is antimicrobial surface treatment. Quaternary ammonium silanes synthesized from CPTMS provide durable biocidal activity when grafted onto glass, textile, or polymer surfaces — a segment that has grown substantially since 2020.
Quaternary ammonium silane synthesis for antimicrobial surfaces, production of specialty silane derivatives, coupling in chlorinated polymer systems, polymer grafting and functionalization. Key industries: antimicrobial coatings, specialty chemical synthesis, surface treatment, healthcare materials.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
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