大分子植酸-聚有机硅倍半氧烷的合成及性能

采用溶胶-凝胶方法, 无需小分子酸催化剂, 利用硅烷化植酸的反应活性和酸催化活性, 与硅烷单体共水解缩聚, 在聚有机硅倍半氧烷分子链上原位接枝植酸, 合成了分子量大于50000的大分子植酸-聚有机硅倍半氧烷. 用GPC, 13C NMR, 29Si NMR, XPS, Raman光谱, SEM及电化学测试等分析手段进行表征, 对比不同酸催化植酸-聚有机硅倍半氧烷(PAP), 单宁酸-聚有机硅半氧烷(TAP), 盐酸-聚有机硅半氧烷(HCP)的结构和性能, 发现植酸-聚有机硅倍半氧烷上的螯合基团与金属表面的活性基团反应而键合, 在金属表面形成致密的保护膜, PAP与TAP和HCP比较具有优异的防腐性能.

Preparation and Properties of Macromolecule Phytic Acid-Polysilsesquioxane

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.