In this study, the effect of ethanol for delaying the polycondensation of silanol in the co-hydrolysis-condensation of tetraethyl orthosilicate-dimethyldiethoxysilane was first explored and demonstrated by varying the amount of ethanol under low-water content and acid-catalyzed. On the basis of this, the controllability of the sol-gel process is realized, and the calculation formula of the gel formation time is provided. The experiment shows that the storage gel time and the reaction gel time are extended from 75 h to at least 4584 h, or from 20 to 65 h with the increase of ethanol concentration, respectively. And we observed the microscopic process of solution-sol-gel transition by light transmission microscope. The sol-gel process established in this experiment gives a mechanism reference for future research. Graphical abstract Graphical abstract

中文翻译：

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可控凝胶研究：乙醇延迟原硅酸四乙酯-二甲基二乙氧基硅烷缩聚的作用

在这项研究中，乙醇在原硅酸四乙酯-二甲基二乙氧基硅烷的共水解-缩合反应中延迟硅烷醇缩聚反应的作用首次通过在低水含量和酸催化下改变乙醇的量来探索和证明。在此基础上实现了溶胶-凝胶过程的可控性，并给出了凝胶形成时间的计算公式。实验表明，随着乙醇浓度的增加，储存凝胶时间和反应凝胶时间分别从75 h延长至至少4584 h，或从20至65 h。并通过透光显微镜观察了溶液-溶胶-凝胶转变的微观过程。本实验建立的溶胶-凝胶过程为以后的研究提供了机理参考。图形摘要图形摘要