Alkyltrimethyl ammonium bromide

The rigidity and strength of networks prepared with cetostearyl alcohol and alkyltrimethyl-ammonium bromides (Cj2-Cjg) increase as the alkyl chain length increases. The rheological stability of ternary systems is markedly dependent on the alcohol chain length networks prepared with ionic or nonionic surfactants and pure cetyl or pure stearyl alcohol are weaker than those prepared with cetostearyl alcohol. In particular, emulsions prepared with stearyl alcohol are mobile and eventually separate. 

Many empirical equations have been developed relating CMC of surfactants to structural units in them. For homologous straight-chain ionic surfactants (soaps, alkylsul-fonates, alkylsulfates, alkylammonium chlorides and alkyltrimethyl-ammonium bromides) in aqueous medium, the following relationship between CMC and the number of carbon atoms (n) in the hydrophobic chain has been obtained (Somasundaran, 1964 Lin, 1971 Somasundaran and Fuerstenau, 1968 Bolden et al., 1983) ... 

Figure 3.16 Log IV against log[suifactant cone] for a series of alkyltrimethyl ammonium bromides (A) Cw (A), C ( ) Cio ( ) Cj ( ) C (O) KBr. Reproduced by permission of Academic Press from I. Piirma (Ed), Emulsion Polymerisation, 1982...

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