| Autor: |
S.D. Seneker, G.J. McCarthy, H. Ahmed, J.E. Glass |
| Rok vydání: |
1986 |
| Předmět: |
|
| Zdroj: |
Colloids and Surfaces. 21:323-334 |
| ISSN: |
0166-6622 |
| DOI: |
10.1016/0166-6622(86)80101-9 |
| Popis: |
The adsorption of a series of water-soluble carbohydrate polymers on peptized montmorillonite is examined. The investigations emphasize the adsorption characteristics of guaran and cellulose ethers. The ether units consisted of methoxyl and carboxymethyl units and chaining adducts, oxyethylene and oxypropylene, of variable length. The guaran and cellulose ethers varied in molar substitution (M.S.) of adduct per pyranose unit and in the sequence lengths of the unsubstituted pyranose units. Nonionic carbohydrate polymers that were not derivatized with pendant ether linkages adsorbed in proportion to their conformational rigidity. The derivatized carbohydrate polymers containing nonionic ether linkages adsorb in amounts greater than anticipated. The amounts of the segmentally rigid ether derivatives adsorbed on peptized montmorillonite were in proportion to their M.S.; the greater adsorptions were related to an ether—cation interaction. The ion—dipole interaction results in polymer entrapment in the interlayer when the interlayer cation is sodium, ammonium or potassium. It is not observed when the interlayer cation is a constant hexahydrate coordinated calcium ion. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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