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Chemical and anticorrosion characterization of polysilsesquioxane coatings catalyzed by different acids

机译:不同酸催化的聚倍半硅氧烷涂层的化学和耐腐蚀性能

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摘要

The polysilsesquioxane coatings were synthesized via the sol-gel reaction of methyltriethox-ysilane (MTES), 3-glycidoxypropyltrimethoxysilane (GPMS), and tetraethoxysilane (TEOS) using different kinds of acid such as phytic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, tannic acid, and hydrochloric acid as the catalysts, and investigated by ~(13)C NMR, ~(29)Si NMR, SEM, electrochemical techniques, and salt-spray test, respectively. It was found that four different acid-catalyzed polysilsesquioxanes were mainly composed of T~2 and T~3 structure, but different acids caused some differences in reaction mechanism and the relative ratio of T~2 to T~3 structure. The catalysis of phytic acid caused more complete polysilsesquioxanes, which had much better corrosion resistant performance than the other three acids-catalyzed polysilsesquioxanes.
机译:聚倍半硅氧烷涂层是通过使用不同种类的酸(例如植酸,1-羟乙叉基-1,1-二膦酸)通过甲基三乙氧基-硅烷(MTES),3-环氧丙氧基丙基三甲氧基硅烷(GPMS)和四乙氧基硅烷(TEOS)的溶胶-凝胶反应合成的酸,单宁酸和盐酸作为催化剂,分别通过〜(13)C NMR,〜(29)Si NMR,SEM,电化学技术和盐雾试验研究。结果发现,四种不同的酸催化聚倍半硅氧烷主要由T〜2和T〜3结构组成,但不同的酸在反应机理和T〜2与T〜3结构的相对比例上存在一定差异。植酸的催化产生了更完整的聚倍半硅氧烷,与其他三种酸催化的聚倍半硅氧烷相比,其具有更好的耐腐蚀性能。

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