SYNTHESIS OF VINYL TRIMETHOXYSILANE-MODIFIED SILICA AND ITS CHARACTERIZATION

• Main Author: Setiawan, Julia
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/47498
• Institution: Institut Teknologi Bandung

Silica has two main function groups, that are inactive siloxane (Si-O-Si) functional group and more active silanol (Si-OH) functional group. In this study, silica modified with vinyl trimethoxysilane (VTMS) has been synthesized. Vinyl functional group (alkenes) is selected because it is very reactive to the addition reaction and polymerization. Silica-VTMS was synthesized using two methods namely one-stage method and two-stage methods. In the two- stage method, silica is synthesized first through the Stöber process with tetraethyl orthosilicate (TEOS) as a precursor, then continued with the modification of silica surfaces using VTMS. Spherical silica with diameter 400 nm has been successfully synthesized using this method but silica does not have satisfactory results when modified with VTMS. In the one-stage method, TEOS and VTMS are reacted directly. Silica-VTMS has been successfully synthesized on this method with a relatively very fast time. The VTMS group is evaluated by measuring concentration of alkenes that react with I2. Determination of concentration of I2 is done using UV-Vis method at 500 nm wavelength. The number of alkenes in silica-VTMS with a volume ratio of VTMS: TEOS (1:3), (1:1), (3:1) and (4:0) has no significant differences, which is (0.24; 0.25; 0.24 and 0.23) g I2/g silica. In this study also concluded that silica-VTMS can be synthesized without the addition of TEOS.