3-Aminopropyltrimethoxysilane (CAS No.: 13822-56-5) is an important organosilicon compound, widely used as a coupling agent for polymer materials and inorganic fillers. Its unique chemical structure and multifunctionality make it play a key role in composite materials, coatings, adhesives, casting and textiles. The following is a detailed introduction to 3-aminopropyltrimethoxysilane:

1. Basic properties
Chemical name: 3-aminopropyltrimethoxysilane
CAS number: 13822-56-5
Molecular formula: C6H17NO3Si
Appearance: colorless and transparent liquid
Density: 1.1060 g/cm³ (20℃)
Refractive index: 1.4260 (25℃)
Content: ≥97%

2. Chemical structure
The molecular structure of 3-aminopropyltrimethoxysilane contains two key functional groups:

Amino group (-NH2): located at one end of the molecule, providing a reactive site, which can react chemically with the active groups (such as epoxy, carboxyl, etc.) in organic polymers (such as resins).

Methoxy group (-OCH3): located at the other end of the molecule, hydrolyzed to form silanol (Si-OH), which can form siloxane bonds (Si-O-Si) with the hydroxyl groups on the surface of inorganic fillers (such as glass fibers, mineral fillers, etc.).

3. Mechanism of action
3-Aminopropyltrimethoxysilane acts as a "bridge" between organic polymers and inorganic fillers through its unique dual-functional structure:

Reaction with organic polymers: The amino group reacts with the active groups in the resin to form a stable chemical bond.

Reaction with inorganic fillers: The methoxy group hydrolyzes and reacts with the hydroxyl group on the surface of the filler to form a siloxane bond.
This dual reaction mechanism significantly improves the interfacial bonding of the composite material, thereby improving the overall performance of the material.


To learn more, click here https://www.siliconematerial.net/