The effects of ultrasonic irradiation on the preparation and properties of Ormosils

✍ Scribed by Kazuki Morita; Yi Hu; John D. Mackenzie

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 573 KB
• Volume: 3
• Category: Article
• ISSN: 0928-0707
• DOI: 10.1007/bf00486717

✦ Synopsis

Organically modified silicates (Ormosils), derived from silica and polydimethylsiloxane (PDMS), have been prepared by the sol-gel method with ultrasonic irradiation. Tetraethoxysilane (TEOS), PDMS, water and HC1 were mixed and exposed to 20 kHz ultrasonic waves under various conditions. Ultrasonic irradiation shortened the gelation time and made it possible to obtain gels without the addition of solvent (e.g. alcohol and tetrahydrofuran (THF)). The reaction mechanism of the ultrasonic irradiated Ormosil solution was investigated by liquid state 29Si NMR. The densities of the gels prepared under ultrasonic irradiation were found to be much higher than those without irradiation. The effect of solvent addition on the properties of gels was also investigated.