Alkaline hydrolysis of alkylated acidic groups on carbon black

✍ Scribed by Yoshimi Matsumura; Shigeji Hagiwara; Hiroshi Takahashi

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 433 KB
• Volume: 14
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(76)90126-3

✦ Synopsis

Potentiometric pa-stat titration was performed on alkylated carbon black dispersed in aqueous solution at pH 9.0, 10.0 and 11.0 and alkaline hydrolysis rate constant of the alkylated functional groups on the carbon black was obtained therefrom. Carbon black treated with C,-C, n-alcohols in vapor or liquid phase was used in this experiment. Hydrolysis proceeded more rapidly for carbon black treated with lower alcohols. For each alkylated carbon black, the hydrolysis rate constant decreased with time and, after the hydrolysis rate diminished, a hydrolysis resistant fraction of alkylated groups remained. For example, the hydrolysis rate constants at 25°C were 24.33, 17.50 and 4.50 1. mol? . sect' at 15 min and 6.00,6.00 and 3.67 1. mol-' . see-' at 45 min after the start of hydrolysis at pH 9.0 for carbon black treated with C,, C, and Cq alcohols respectively.