抄録
The ion exchange reactions of the carboxyl groups in cellulose, especially their fully exchanged conditions, were surveyed theoretically and experimentally with Ca++ ion.
Formally it was known that a high concentration of the cation M++ and a low concentration of hydrogen ion H+ were favourable to the complete exchange in the required direction. But the strict relationship between M++ and H+ and absorption ratio was not clearly known.
In this study it was found that the carboxyl groups in cellulose reacted as the weak acid exchange resin and the relationship between M++ and H+ and absorption ratio was as follows. (cf. Fig. 3)
The minimum concentration of Ca++ ion and pH of the solution to exchange all the free carboxyl groups to metal form was determined.
