Dispersion examples

PAAs with a MW of approximately 4,000 to 6,000 are useful as general-purpose dispersants. Examples include Polacryl A50-43, Good-Rite K732, Acumer 1100, Aquatreat AR-602, Sokalan PA25, and BSI 89. 

Interfacial polycondensation can be also performed in dispersion (Example 4-13) For this purpose the solution of acid dichloride is dispersed in the aqueous solution of diamine by vigorous stirring (if necessary in the presence of a water-soluble dispersion stabilizer). The polycondensation then takes place at the surface of the droplets. Water is especially suitable as solvent for the diamine component, while aliphatic chlorinated hydrocarbons are best for the dicarbox-ylic acid dichlorides. 

The removal of the gas phase from a dispersion. Example Some non-aqueous foams (made from bitumen or heavy crude oils) are very viscous and are de-aerated by processes such as contacting with steam in cascading froth, countercurrent steam-flow vessels. 

Any species that can be used to aid in the formation of a colloidal dispersion. Examples dispersant for dyestuffs, dispersant for pigments. Often a surfactant, such as a fatty acid derivative. 

Any machine for preparing colloidal systems by dispersion. Examples colloid mill, blender, ultrasonic probe. See Airless Spraying. 

For some applications, polymers are blended to provide a balance of properties. Some polymers blend well due to mutual solubility, but if the solubility parameter of the candidate polymers is different by more than about 3 SI units, the polymers must be blended with an intermediate material to improve compatibility. Typically, this involves an intermediate polymer with a low molecular weight. In the melt, this serves to reduce the surface tension between two incompatible polymers, thus improving dispersion. Low molecular weight polyethylene is an example of a polymer blending aid. In other cases, metal stearates or salts can be used to aid dispersion. Examples include zinc stearate and calcium stearate. 

Ammonium oxymolybdenum complexes with amines These complexes are prepared by the acid/base reaction of an acidic molybdenum source such as molybdenum trioxide, molybdic acid, ammonium molybdate [41] and ammonium thiomolybdates with oil-soluble amines [42], The preferred aminic compounds are lubricant additives known as dispersants, examples being succinimides and Mannich-type bases, as in Reactions (4.42) and (4.43) [41] ... 

P14>180 Load the laminar flow with dispersion example on the FEMLAB CD-ROM. Keep Da and L/R constant and var> the reaction order n, (0.5 < n < 5) for different Pedet numbers. Are there any combinations of n and Pe where dispersion is more important or less imponam on the exit concentration What generalizations can you make Hint for n < 1 use r = -k (AbsiC )) P14-19c Revisit the FEMLAB Example 14-3 for laminar flow with dispersions. 

Very interesting PHD polyols are obtained by the reaction in polyether media of TDI with primary amines and, instead of polymeric polyurea, organic diurea compounds are generated, insoluble in polyethers, in the form of a very fine dispersion. Example of amines used include ammonia, anilines and substituted anilines, and fatty amines (reactions 6.22 and 6.23). 

Association CoUoid A dispersion of colloidal-sized aggregates of small molecules. These are lyophilic dispersions. Example micelles of surfactant molecules in water. 

LyophUic Colloid An older term used to refer to single-phase colloidal dispersions. Examples polymer and micellar solutions. 

Application of Melt Dispersion Examples Published Since 2000... 

Dispersed phase Dispersion medium Name of dispersion Examples... 

Another possible way to reduce the costs might be to directly use the colloidal CNT/polymer latex dispersions. Examples of this... 

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