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HASESHigh-Assurance Systems Engineering Symposium (IEEE)
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The paints in the optical study had a HASE concentration of about 1.5% based on continuous phase.
Therefore, a study was done to evaluate dispersion of Ti[O.sub.2] in 2% HASE solution containing 1% low-carboxylate dispersant and either SDS or OP (EO)[.sub.40].
Also, studies of HASE systems are not well represented in the literature.
Dispersion samples were prepared based on 0.05 volume fraction colorant in 2% HASE solution and surfactant concentrations were based on the continuous phase.
These results suggest that even though the HASE polymers do adsorb onto the exterior Ti[O.sub.2], they are weakly adsorbed and easily displaced by low levels of dispersant.
The highest contrast ratio and gloss numbers are observed for the HEUR and HASE systems with a hydrophobic dispersant, as expected from the dispersion diagrams.
The best results are still obtained using the hydrophobic dispersant with the HEUR and HASE thickeners, but the differences are smaller.
(5) HASE disperses both exterior and interior Ti[O.sub.2].
Model BA/MMA latexes of 340, 140, and 50 nm particle diameter were studied in the presence of the HASE and SDS.
Electrolytes tend to increase the "strength" of the hydrophobic interactions by a salting out effect on both the HASE and the surfactant.
HYDROPHILIC LATEX SURFACE: When the latex surface is made more hydrophilic, as when carboxylic acid-based monomers are used in the polymerization, the number of hydrophobic sites available for the surfactant and HASE hydrophobes is reduced.
When the latex surface is made more hydrophobic, interactions with the HASE molecules are increased, as expected, due to the higher number of sites for possible adsorption.