Synthesis of amino silicone resins by three-step method and characterization

Amino silicone resins were synthesized through a three-step method using (3-aminopropyl) triethoxysilane (APTES), methyltrimethoxysilane (MTMS) and end-capping agents, The products were characterized by Fourier transformed infrared spectroscopy (FT-IR), nuclear magnetic resonance (1H NMR), element analysis and gel permeation chromatography (GPC). The results of 1H NMR indicate that the chemical shift signal of acid-catalyzed products is weak at δ3.4 (attributing to alkoxy). FT-IR shows that there is a vibration peak of Si-OH at 3 100–3 600 cm−1 and the intensity of the peaks is most weak at 6h. The results show that this method cannot only effectively reduce the residue of alkoxy groups and Si-OH groups, but also obtain the products with sufficient amino group. It concludes that this resin is suitable as modifier in the silicone rubber.