Comparative analysis of phase diagrams of organochlorosilane/organoalkoxysilane—solvent—water systems

Ivanov, Pavel; Mazhorova, N. G.

doi:10.1007/s11172-020-2867-7

Cited by 3 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Soluble highly functional organosilsesquioxanes are of particular interest. The complexity of obtaining such structures by traditional approaches, such as hydrolytic polycondensation of organotrichlorosilanes [ 1 , 22 ] and catalytic hydrolysis of organotrialkoxysilanes [ 3 , 23 , 24 ], is due to high degree of condensation of the products, caused by the high reactivity of the monomer, and the formation of hydrochloric acid during the reaction in the first case and the using of catalysts in the second [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Multifunctional Oligomethylsilsesquioxanes by Catalyst-Free Hydrolytic Polycondensation of Methyltrimethoxysilane under Microwave Radiation

et al. 2023

View full text Add to dashboard Cite

The catalyst-free hydrolytic polycondensation of methyltrimethoxysilane under microwave radiation has been studied. The effect of molar ratios of the reagents (MTMS/H2O = 1/0.5–1/9), radiation power (20–300 W), temperature (30–50 °C) and duration of exposure (2.5–90 min) on the course of the process is considered. It has been shown that the use of microwave radiation promotes the activation of the process, and almost complete conversion of the monomer can be achieved in 5 min at 30 °C, 20 W and an MTMS/H2O ratio of 1/3. The optimal radiation power for the maximum conversion of the monomer and MeO-groups is in the range from 20 to 100 W. An increase in the water amount, the duration and temperature of the process contribute to an increase in the monomer conversion, a decrease in the content of residual MeO-groups and the yield of non-volatile oligomethylsilsesquioxanes. The limits of this approach using to the synthesis of multifunctional branched polyorganosilsesquioxanes are determined. Depending on the process conditions, homogeneous water–alcohol solutions of oligomethylsilsesquioxane with a concentration of 20 to 50 wt.% can be obtained. The OH-group content and the molecular weight of the obtained oligomers vary from 10 to 30 wt.% and from 1000 to 600 Da, respectively.

show abstract