Infrared Study of the Adsorption of 1-Aminopropyltrialkoxysilanes on Silica at the Solid/Liquid Interface

✍ Scribed by Andrew S. Piers; Colin H. Rochester

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 381 KB
• Volume: 174
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1995.1369

✦ Synopsis

Infrared spectra are reported for silica in two states of surface hydroxylation immersed in carbon tetrachloride containing in particular ( (\mathrm{MeO}){3} \mathrm{SiCH}{2} \mathrm{CH}{2} \mathrm{CH}{2} \mathrm{NH}{2}). Adsorption involved hydrogen bonding between silanol and (\mathrm{OMe}) or (\mathrm{NH}{2}) groups. At moderate coverages the silane was bonded to two or three silanol groups via OMe groups, but at high coverages reorientation in the adsorbed layer accompanied further adsorption, leading to 1:1 silanol:silane hydrogen bonding solely via amino groups. This behavior was unaffected by the degree of overall surface hydroxylation. Adjacent interacting surface silanol were more reluctant to be involved in bi- or tridentate bonding but at high silane concentrations also gave a 1:1 interaction via (\mathrm{NH}_{2}) groups. 1995 Academic Press, Inc.

Key Words: 1-aminopropyltrialkoxysilane adsorption; adhesion, IR of coupling agents; adsorbed silanes on silica.