ISSN:
1435-1536
Schlagwort(e):
Emulsion
;
amphiphilic polymer
;
associative polymerstability
;
rheology
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
Notizen:
Abstract Hydrophobically Modified (with alkylamide chain) linear Poly(acrylic acid) Sodium Salt (HMPAANa) of various degree of grafting (τ) and alkyl chain length (n) were synthesized and used as emulsifiers ofn-dodecane/water (NaNO3 10−3M) system. Stability and flow properties of the resultingn-dodecane in water emulsions (dispersed phase volume fraction=0.5) were investigated as a function ofτ (τ=0 to 10% in mol),n (n=12, 18) and polymer concentration (0–10%). It was clearly shown that viscosification (via an associative mechanism of HMPAANa) of the external phase of emulsions is a key factor to explain dispersions breakdown. However, a complete description of the phenomenon could not be achieved without considering the adsorption of the polymer at the liquid-liquid interface which depends closely onτ andn. More generally, the behavior of emulsions was found to be described adequately by the degree of hydrophobicity of HMPAANa's using a simple model conjugating the effects ofτ andn. As a matter of fact, the model was also found to provide a satisfactory description of HMPAANa's aqueous solutions as well, so that a good picture of emulsions properties can be deduced from the polymer behavior in water.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01188956
