Mingyi silicone（anhui）co,.ltd
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In modern organosilicon chemistry, vinyl-terminated structures play a fundamental role in controlling crosslinking reactions and molecular architecture within addition-cure systems. Divinyltetramethyldisiloxane, commonly referred to in the industry as “Vinyl Double Heads,” is a key low-molecular-weight functional siloxane widely used in high-performance silicone production.
IOTA 1002 is a high-purity divinyltetramethyldisiloxane specifically designed for platinum-catalyzed addition systems. It serves as a critical intermediate and reactive modifier in liquid silicone rubber (LSR), silicone gels, vinyl silicone fluids, vinyl silicone resins, and platinum complex production.
Chemical Name: Divinyltetramethyldisiloxane
CAS No.: 2627-95-4
Molecular Formula: [(CH₃)₂C₂H₃Si]₂O
Molecular Weight: 186.40
Appearance: Colorless transparent liquid
Boiling Point: 133–139°C
Density: 0.818 g/cm³
Refractive Index: 1.4118–1.4123
Purity: ≥99.5%
Vinyl Content: 29.0%
Water Solubility: Insoluble
Its controlled purity and structural consistency ensure reliable performance in platinum-catalyzed systems without introducing undesirable side reactions.
Divinyltetramethyldisiloxane is a bifunctional siloxane monomer containing two terminal vinyl groups (–CH=CH₂) linked by a siloxane bridge (Si–O–Si).
This molecular configuration provides:
The vinyl groups react efficiently with Si–H functional siloxanes under platinum catalysis, forming the backbone of addition-cure silicone networks.
As a vinyl-terminated structure, it helps regulate molecular weight distribution and crosslink density.
It enables precise control of curing speed and mechanical properties through formulation adjustment.
In LSR formulations, IOTA 1002 is used to:
Adjust total vinyl functionality
Optimize crosslink density
Improve tensile and elongation properties
Fine-tune curing behavior
High purity ensures stability in medical, food-grade, and electronic applications.
For soft and low-modulus silicone gels, it provides:
Hardness adjustment
Enhanced transparency
Improved elasticity
Better flow performance
Commonly applied in electronic potting and optical encapsulation.
It serves as a reactive intermediate for:
Vinyl-terminated silicone oils
Vinyl-modified silicone resins
Functional siloxane copolymer synthesis
Essential in high-temperature coatings and advanced electronic materials.
Divinyltetramethyldisiloxane is also a key ligand in platinum-vinyl complex production, particularly in Karstedt catalyst systems.
Its high purity contributes directly to catalyst stability and activity.
Purity ≥99.5% for consistent performance
Low moisture and impurities
Stable reactivity in hydrosilylation systems
Broad compatibility with addition-cure formulations
As demand grows for high-performance LSR, electronic encapsulation materials, and medical silicones, the need for high-purity vinyl-terminated intermediates continues to expand.
Applications driving market growth include:
Medical-grade silicone components
EV and renewable energy electronics
Optical silicone materials
Precision molding technologies
Future development trends emphasize even stricter purity control, lower volatile content, and higher consistency standards.
