End hydrogen containing silicone oil and side hydrogen containing silicone oil: trade-off between crosslinking efficiency and steric hindrance
Fundamental differences in molecular structure:


End hydrogen containing silicone oil: The molecular chain has active Si-H bonds at both ends, with a hydrogen bond density of 2 per molecule. The reaction efficiency is twice that of the side hydrogen containing type, but the steric hindrance is relatively large.
Side hydrogen containing silicone oil: It only has Si-H bonds at one end of the molecular chain, with a hydrogen bond density of 1 per molecule and lower steric hindrance, making it suitable for high-temperature curing scenarios.
Industrial application differentiation:
Hydrogen terminated silicone oil: form a nano lotion with a particle size of 50-100nm in the cosmetics emulsification field for sunscreen; In the production of medical catheters, the elongation at break can exceed 800% by expanding the chain with liquid silicone rubber.
Side hydrogen containing silicone oil: dominating the sealing field of automotive turbochargers, capable of withstanding high temperatures above 200 ℃; In the concrete protection of the cross sea bridge, a 20-year long-term protection is achieved, with a tensile strength of over 10MPa.
Technology trend: Developing "double bond sealing" technology for hydrogen containing silicone oil, improving storage stability to 24 months; Side hydrogen containing silicone oil introduces fluorine element and has a corrosion resistance time of over 1000 hours against 98% concentrated sulfuric acid.