Multi-nuclear liquid state NMR investigation of the effects of pH and addition of polyethyleneglycol on the long-term hydrolysis and condensation of tetraethoxysilane

作者：Wu, Cheng Hsien; Jeng, Jiann Shing; Chia, Jie Lun; Ding, Shangwu^*

来源：Journal of Colloid and Interface Science, 2011, 353(1): 124-130.

DOI：10.1016/j.jcis.2010.09.024

• TEOS
• PEG
• Condensation
• Hydrolysis
• NMR

The long-time behavior of the hydrolysis and condensation reaction of the tetraethoxysilane (TEOS) pre-solution at different pH values with and without addition of polyethyleneglycol (PEG) for various aging times was characterized by liquid H-1, C-13, and Si-29 NMR spectroscopy. After aging, the alcohol is released in the TEOS pre-solution without addition of PEG at pH 3 and 9. On the other hand, the hydrolysis and condensation rates of the TEOS pre-solutions with addition of PEG at pH 3 and 9 increase except for the TEOS pre-solution with addition of PEG 2000 at pH 9. However, the hydrolysis and condensation rates of the TEOS pre-solutions with and without addition of PEG at pH 5 and 7 are almost the same before and after aging. The effects of the pH values, polymer size and aging times on the hydrolysis and condensation reaction of the TEOS pre-solutions are discussed.

• 出版日期2011-1-1
• 单位中山大学