Synthesis and Characterization of a Silicone Resin with Silphenylene Units in Si–O–Si Backbones II

A silicone resin with silphenylene units in Si—O—Si backbones was prepared through hydrolysis-polycondensation of self-synthesized 1,4-bis(diethoxymethylsilyl)benzene (BDSB) and other alkoxysilanes. The structure and properties of this novel silicone resin were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TG), scanning electron microscope (SEM) and electrochemical impedance spectrum (EIS). The results of GPC, IR and NMR showed that silphenylene units had been successfully incorporated into the backbones of silicone resin. TG analyses reveal that silicone resin with silphenylene units in its backbones had a higher heat resistance than the usual methyl phenyl silicone resin. SEM results demonstrated that this silicone resin could form a full and uniform film, and its clear paints were able to stand temperatures below 350 °C. EIS analysis revealed that clear paints of this silicone resin have good resistance to corrosion.