TRIETHYL ALKYL AMMONIUM BROMIDE

Note Examples are potassium salts of unbranched alkanoic acids, lecithin, certain polyisocyanates, cellulose derivatives with side-chains, such as (2-hydroxypropyl)cellulose, and cyanobiphenyl derivatives of alkyl(triethyl)ammonium bromide. 

Effects of added n-alkyl triethyl ammonium bromides upon the mechanical stability of natural rubber latex (9)... 

Some interesting results have recently become available for the effects of a range of n-alkyl triethyl ammonium bromides upon the mechanical stability of natural rubber latex. The number of carbon atoms in the alkyl group varied from 6 to 18. Figure 6 summarises the results. It is usually believed that the addition of cationic surfactants to an anionic latex such as natural rubber latex invariably leads to a reduction in colloid stability, the effect being attributed to adsorption of the cations with consequent partial neutralisation of the particle charge and reduction of the counterion cloud surrounding the particles. 

Whilst the results summarised in Figure 6 show that this expectation is often realised, they also show that small additions of an n-alkyl triethyl ammonium bromide whose alkyl group contains between approximately 8 and 12 carbon atoms can bring about a small increase in mechanical stability. In such cases, the increase in stability cannot possibly be attributed to enhance-... 

---