Stabilization physical

Amberlite IR-120 1.9 1.26 8% styrene-DVB type high physical stability. 

Physical Stabilization Process. Cellulai polystyrene [9003-53-6] the outstanding example poly(vinyl chloride) [9002-86-2] copolymers of styrene and acrylonitrile (SAN copolymers [9003-54-7]) and polyethylene [9002-88-4] can be manufactured by this process. 

Chemical Stabilization Processes. This method is more versatile and thus has been used successfully for more materials than the physical stabilization process. Chemical stabilization is more adaptable for condensation polymers than for vinyl polymers because of the fast yet controUable curing reactions and the absence of atmospheric inhibition. 

Physical Stabilization Process. CeUular polystyrene, ceUulose acetate, polyolefins, and poly(vinyl chloride) can be manufactured by this... 

Physical stability The quality which an ion-exchange resin must possess to resist changes that might be caused by attrition, high temperatures, and other physical conditions. 

Good physical stability Copolymerization process and pore... 

Equation (8.29) provides no guarantee of stability. It is a necessary condition for stability that is imposed by the discretization scheme. Practical experience indicates that it is usually a sufficient condition as well, but exceptions exist when reaction rates (or heat-generation rates) become very high, as in regions near thermal runaway. There is a second, physical stability criterion that prevents excessively large changes in concentration or temperature. For example. An, the calculated change in the concentration of a component that is consumed by the reaction, must be smaller than a itself Thus, there are two stability conditions imposed on Az numerical stability and physical stability. Violations of either stability criterion are usually easy to detect. The calculation blows up. Example 8.8 shows what happens when the numerical stability limit is violated. 

Chemical and physical stability (degradation, aggregation or fusion, reduction of drug retention)... 

Crommelin, D. J. A. (1984). Influence of lipid composition and ionic strength on the physical stability of liposomes, J. Pharm. Sci.. 73, 1559-1563. 

For the support material of electro-catalysts in PEMFC, Vulcan XC72(Cabot) has been widely used. This carbon black has been successfully employed for the fuel cell applications for its good electric conductivity and high chemical/physical stability. But higher amount of active metals in the electro-catalysts, compared to the general purpose catalysts, make it difficult to control the metal size and the degree of distribution. This is mainly because of the restricted surface area of Vulcan XC72 carbon black. Thus complex and careM processes are necessary to get well dispersed fine active metal particles[4,5]. 

Park, Y.S. et ah. Physical stability of the blue pigments formed from geniposide of Gardenia fruits effects of pH, temperature, and light, J. Agric. Food Chem., 49, 430, 2001. 

Stability may be inherent or induced. In the latter case, the original system is in a condition of metastable or neutral eouilibrium. External influences which induce instability in a dispersion on standing are changes in temperature, volume, concentration, chemical composition, and sediment volume. Applied external influences consist of shear, introduction of a third component, and compaction of the sediment. Interfacial energy between solid and liquid must be minimized, if a dispersion is to be truly stable. Two complementary stabilizing techniques are ionic and steric protection of the dispersed phase. The most fruitful approach to the prediction of physical stability is by electrical methods. Sediment volumes bear a close relation to repulsion of particles for each other. 

Physical stability and resistance to osmotic and hydraulic shock. 

Stability considerations Chemical stability Physical stability Microbiological stability Bioavailability stability... 

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