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  • Vinyltrimethoxysilane VTMO

    Vinyltrimethoxysilane(VTMO)

    Molecular formula: CH2=CHSi(OCH3)3

    Product article: IOTA-21

    Introduction

    Vinyltrimethoxysilane(VTMO) is used as a polymer modifier via grafting reactions. The resulting pendant trimethoxysilyl groups can function as moisture-activated crosslinking sites. The Silane grafted polymer is processed as a thermoplastic and crosslinking occurs after fabrication of the finished article upon exposure to moisture.

    Physical Properties

    Chemical Name: Vinyltrimethoxysilane

    Formula: C5H12O3Si

    Molecular Weight: 148.2

    Appearance: Colorless transparent liquid

    Specific gravity :  0.960-0.970

    Boiling Point: 122(760mmHg)

    Refractive Index: 1.3905 (25℃)

    Flash Point: 28

    CAS No.: 2768-2-7

    EINECS No.: 220-449-8

    Purity: Min 98.0%

    Applications:

    1.Polymer Modification: Vinyltrimethoxysilane(VTMO) is used to modify polyethylene and other polymers by grafting its vinyl group to the polymer backbone using a radical initiator, such as peroxide. This provides a polymer with pendant trimethoxysilyl groups that may be used as moisture-activated crosslinking sites via hydrolysis of the alkoxy groups followed by condensation of the resulting silanols.

    2.Crosslinking of Silane-Grafted Polymers: The reaction of Silane grafted polyethylene to form a crosslinked or vulcanized polyethylene uses water to form the crosslinks. This technology is widely used around the world for commercial applications in wire and cable insulation, tubing, and other similar uses.

    The basic reaction sequence is as follows: polyethylene is reacted (grafted) with vinyltrimethoxysilane, using a peroxide initiator, in an extruder. The grafted polyethylene is then formed into a finished product, such as cable jacketing, wire insulation, or pipe. The forming step is usually done by a second extrusion, during which a catalyst for the moisture-cure step is added. Finally, the formed article is exposed to moisture or hot water to cause hydrolysis of the Silane and condensation to form crosslinks via Si-O-Si bond formation.

    Benefits of Crosslinking:

    1. Higher maximum use temperature

    2. Reduced deformation under load (creep)

    3. Improved chemical resistance

    4. Superior environmental stress crack resistance

    5. Increased abrasion resistance

    6. Improved impact strength

    7. Memory characteristics (shrink film, tubing)

    8. Improved impact strength

    Advantages of Silane Crosslinking over Radiation or Peroxide Crosslinking

    1. Low capital investment

    2. Low operating (energy) costs

    3. Higher productivity

    4. Processing versatility

    5. Thick, thin, or variable thicknesses possible

    6. Complex shaps possible

    7. Wilder processing latitude (control of premature crosslinking)

    8. Useful with filled composites

    9. Applicable to all polyethylene densities and copolymers.



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