Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Applied Mechanics and Engineering

1 1999

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: polyelectrolyte solutions

Sortuj według:

Ogranicz wyniki do:

The influence of the ionic strengths of polyacrylamide and xanthan gum

Gampert B., Wilkes C.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

283-288

Polyelectrolytes are macromolecules which carry a large quantity of ionizable groups along their chains. By dissolving them in suitable solvents, for example water, these groups dissociate in highly charged macroions and an equivalent quantity of low molecular counter ions. Through the bonding of polymer and electrolyte properties this class of materials obtains its peculiar characteristic behaviour. For the characterization of phenomenological effects of polyelectrolyte solutions, viscometric and conductometric methods will be applied for this paper. There, the viscosity measurements will be carried out using highly dilute polymer concentrations where the intermolecular interactions play a role. The experiments undertaken here were carried out using a commercial, anionic polyacrylamide and xanthan gum with different hydrolysis factors and molecular weights. The reduced viscosity increases strongly with the decrease of polymer concentration for low cp values. It reaches a maximum and then decreases again.