Abstract: The high-molecular-weight phytic acid-polysilsesquioxane was successfully synthesized via sol-gel process by using silylated phytic acid reacting with MTES and TEOS without any low molecular acid, and the molecular weight of phytic acid-polysilsesquioxanes was more than 50000. Phytic acid served not only as catalysts but also reactant and chelating agent, which was in-situ incorporated with polysilsesquioxane chain uniformly. GPC, ¹³C NMR, ²⁹Si NMR, XPS, Raman spectrum, SEM and electro-chemical techniques were used to investigate the correlation between the microstructure and property of PAP, TAP and HCP. PAP could form a compacting protective film because of strong chemical interaction between metal substrate and phytic acid-polysilsesquioxane, which had a significantly better corrosion resistance compared to tannin-catalyzed polysilsesquioxane and HCl-catalyzed polysilsesquioxane.

Key words: Acidic chelant, Phytic acid-polysilsesquioxane, Anticorrosion