Potentiometric titration of polyelectrolytes having stiff backbones
✍ Scribed by Yoshio Muroga; Kazutoshi Suzuki; Yoshikazu Kawaguchi; Mitsuru Nagasawa
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1972
- Tongue
- English
- Weight
- 426 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0006-3525
No coin nor oath required. For personal study only.
✦ Synopsis
The potentiometric titration curves of carboxymethylcellulose, which has a relatively stiff backbone, and also of poly(D-glutamic acid) in the helical region are compared with the theoretical curves calculated assuming that the polyions are rods and have smeared charges on their surfaces. For carboxyniethylcellulose good agreement is observed when its charge density is high, whereas as the charge density decreases the calculated curves deviate from the observed ones. The main reason for the disagreement a t low charge densities may be attributed to the flexibility of the polymer backbone. For helical poly(w glutamic acid) satisfactory agreement between calculated and observed curves is found if a radius thicker than the realistic radius is employed. The reason for the excessively large radius may be attributed to the inapplicability of the smeared charge model.