Abstract

According to ¹H, ¹³C, and ²⁹Si NMR spectroscopy, in the hydrolytic copolycondensation of 3‑aminopropyltriethoxysilane and 3-methacryloxypropyltrimethoxysilane, side reactions of addition of amine groups to methacrylate groups (the Michael reaction), as well as partial hydrolysis and transesterification of ester bonds, occur along with the main process of the formation of oligomeric silsesquioxanes. Depending on the ratio of the starting alkoxysilanes, the oligomers are soluble in water (excess of 3-aminopropyltriethoxysilane) or in organic solvents (excess of 3-methacryloxypropyltrimethoxysilane). Mixed oligomers are capable of gelation at room temperature; the duration of the process increases and the content of the gel fraction decreases with an increase in the proportion of 3-methacryloxypropyltrimethoxysilane units in the oligomer molecules.

中文翻译：

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3-氨基丙基三乙氧基硅烷和3-甲基丙烯酰氧基丙基三甲氧基硅烷水解共缩聚产物的结构：核磁共振研究

摘要

根据¹ H、¹³ C 和²⁹Si NMR光谱，在3-氨基丙基三乙氧基硅烷和3-甲基丙烯酰氧基丙基三甲氧基硅烷的水解共聚缩聚中，伴随着主要过程发生胺基与甲基丙烯酸酯基团加成的副反应（迈克尔反应），以及酯键的部分水解和酯交换反应。低聚倍半硅氧烷的形成。根据起始烷氧基硅烷的比例，低聚物可溶于水（过量的 3-氨基丙基三乙氧基硅烷）或有机溶剂（过量的 3-甲基丙烯酰氧基丙基三甲氧基硅烷）。混合低聚物能够在室温下凝胶化；随着低聚物分子中3-甲基丙烯酰氧基丙基三甲氧基硅烷单元比例的增加，该过程的持续时间增加并且凝胶分数的含量降低。