Synthesis of acrylic-modified sol-gel silica

• Published in: Colloid and polymer science Vol. 284; no. 5; pp. 529 - 535
• Main Authors: PINTO, Patricia R, MENDES, Luis C, DIAS, Marcos L, AZUMA, C
• Format: Journal Article
• Language: English
• Published: Berlin Springer 01-02-2006; Springer Nature B.V
• Subjects: Applied sciences; Chlorides; Compounding ingredients; Condensing; Dental materials; Derivatives; Exact sciences and technology; Fillers and reinforcing agents; Polymer industry, paints, wood; Polymerization; Reaction time; Silicon dioxide; Technology of polymers; Thermogravimetry; Surface reaction; Experimental study; Compatibilizer; Silica; Esterification; Composite material; Thermal stability; Sol-gel process ,Hybrid acrylic-silica ,Acryloyl chloride; Chemical modification; FT-IR ,TG/DTG; Sol gel process; Morphology; Chemical synthesis; Filler; Modified material
• ISSN: 0303-402X; 1435-1536
• DOI: 10.1007/s00396-005-1424-0

Silica was obtained by sol-gel process through hydrolysis and condensation of tetraethyl orthosilicate (TEOS) using molar fraction of H^sub 2^O/TEOS=9 under alkaline catalysis, at different reaction times (5 min to 24 h). At the end of each time, the reaction medium appeared as a suspended microparticle system. After solvent evaporation, the yield was calculated to be around 100% and practically independent of the time of reaction. The silica had its surface modified through the condensation reaction with acryloyl chloride forming organically modified silica. The unmodified and modified silica were characterized by thermogravimetry and derivative thermogravimetry (TG/DTG), infrared spectrometry (FT-IR), size particle and optical microscopy (OM). The acrylic content was independent of the reaction time. The methodology represents an alternative route to obtain silica with an unsaturated organic group, able to polymerize and stabilize up to 300-400°C. The modified material has a potential application as compatibilizing filler in dental composite.[PUBLICATION ABSTRACT]