| Abstract: | Comparing Investigations on the Silicate Constitution in (Ethyl)n(2-hydroxyethyl)4?n-ammonium] Silicate Solutions with n from 3 to 1 and on the Influence of Alkali Hydroxide In (ethyl)n(2-hydroxyethyl)4?nammonium]-silicate solutions with n from 3 to 1, free of alkali hydroxides, double three-ring and double four-ring silicate anions are to be found. With a growing number of 2-hydroxyethyl groups contained in the ammonium ion, the part of double four-ring ions increases. Other influating factors are the molar ratio of organoammonium hydroxide to silicon dioxide and the SiO2-concentration. Admixtures of alkali hydroxides modify the ratio of double three-ring to double four-ring ions and cause also a degradation of both kinds of silicate ions, the effect of sodium hydroxide surpassing that of potassium hydroxide. |
