Linear vinyl‑terminated polydimethylsiloxane, CAS No. 68083‑19‑2, is a highly reactive silicone intermediate widely utilized for silicone rubber manufacturing and polymer modification. It inherits fundamental performances of conventional dimethyl silicone oil. Terminal vinyl double bonds bring versatile chemical reactivity to meet diversified formulation requirements for various polymer systems.
Key Product Features
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Terminal vinyl groups exhibit high reactivity. Under catalysis, it can proceed hydrosilylation reaction with hydrogen‑containing silicone oil and participate in multiple organic synthesis reactions, serving as essential base polymer for addition‑curable silicone systems.
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Better compatibility with organic polymers such as polyurethane and acrylic resin compared with ordinary dimethyl silicone oil, facilitating blending and compounding processes.
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Reactive C=C double bonds allow graft modification with polyurethane and acrylic materials to produce weather‑resistant, anti‑aging and UV‑shielding composite materials.
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Wide adjustable range of viscosity, molecular weight and vinyl content. Multiple grades from low viscosity to ultra‑high viscosity are available for diverse formulation designs.
Typical Technical Specifications (at 25℃)
|
Viscosity(mPa·s)
|
Molecular Weight
|
Vinyl Content (wt%)
|
Density
|
|
0.7
|
186
|
29
|
0.81
|
|
2‑3
|
500
|
10‑12
|
0.92
|
|
4‑6
|
770
|
7‑9
|
0.93
|
|
10
|
1000
|
5.4
|
0.95
|
|
20
|
2000
|
2.7
|
0.95
|
|
100
|
6000
|
0.8‑1.2
|
0.97
|
|
200
|
9400
|
0.4‑0.6
|
0.97
|
|
500
|
17200
|
0.37‑0.43
|
0.97
|
|
1000
|
28000
|
0.18‑0.26
|
0.97
|
|
3500
|
43000
|
0.12‑0.15
|
0.97
|
|
5000
|
49500
|
0.10‑0.13
|
0.97
|
|
10000
|
62700
|
0.08‑0.12
|
0.97
|
|
20000
|
72000
|
0.06‑0.09
|
0.98
|
|
65000
|
117000
|
0.04‑0.06
|
0.98
|
|
165000
|
155000
|
0.03‑0.04
|
0.98
|
Note: For identical chemical backbone, higher molecular weight corresponds to higher viscosity and lower mass fraction of vinyl groups.
Main Application Fields
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High‑Temperature Vulcanized Silicone Rubber (HTV)：Base raw material to adjust mechanical properties including tensile strength and hardness, widely used in compounded silicone rubber compound.
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Liquid Silicone Rubber (LSR for injection molding)：Core base polymer for addition‑cure liquid silicone rubber for injection moulding articles.
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Polymer & Coating Modification：Chemically react with polyurethane and acrylic resin to modify plastics, resins and coatings, improving weather resistance, UV‑resistance and toughness for paints and composite materials.
