Rheological classification types

TABLE 5.1 Classification of Various Types of Organic and Inorganic Rheology Modifiers... 

The response of heterogeneous systems to a stress field allows them to be placed in two categories (i) those in which stress induces irreversible changes e.g., precipitation, denaturation of protein, crystallization, etc.) and (ii) those in which the changes are reversible. The classification is not perfect, as the type and magnitude of stress field can be cmcial, but it provides a guide in most cases, miscibility in systems (i) is reduced by stress, while in systems (ii) it is increased. In other words, if a system can be irreversibly modified by rheological means, its solubility will be reduced. An excellent review on phase transition in shear flow was recently published [Onuki, 1997]. 

In some classification applications, the required cut point is very sharp and the rheology of both separated phases is such that they remain quite fluid. In this type of application the pond used would be relatively deep, and separation would be akin to a liquid/liquid separation, using a hydraulic balance under some form of baffle. 

Due to the existence of different adhesive systems and the potential hazards associated with each system, there are different types of pack ing as well as stor e conditions and shelf fives. Adhesives can be differentiated based on specific criterion and properties. In the literature, one can find various classifications based on the assembly process, delivery form, adhesion mechanism, or application. Within the same adhesive group, the adhesives can be further differentiated based on their physical states or characteristics liquid, paste, or solid (throi viscosity measurements and rheological characterization), and solvent based, water based, or those without volatile content (through solid content measurements). Another classification can be made based on the adhesion mechanism physically dried adhesives from solution, solidified hot-melt adhesive, or chemically cross-linked single- and two-component reactive adhesives. 

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