Steady Shear Viscous Properties

Chapters 6 to 9 discuss the steady shear viscous properties, steady shear elastic properties, unsteady shear viscoelastic properties and extensional flow properties, respectively. The effect of filler type, size, size distribution, concentration, agglomerates, smface treatment as well as the effect of polymer type are elucidated. The tenth chapter has been... 

Various fillers were dispersed in different pol)mier matrices [21,22] and their relative viscosity vs. volume fraction was plotted as shown in Figure 6.3(a). It is seen that the relative viscosity of the filled polymer system adjudged at the same volume fraction varies with the properties of the filler such as shape, size, size-distribution, surface appearance, etc. It is quite obvious what the effect of the physical nature of the filler surface would be on the steady shear viscous properties of the filled polymer systems. The higher the surface roughness the greater the resistance to flow deformation and hence the viscosity of filled system... 

Surface modifiers are generally bifunctional molecules with one end capable of adhering to the filler and the other end compatible wifii the pol5mier, and at times even capable of reacting with it. There have been extensive studies on the effect of surface treatment on the steady shear viscous properties of filled pol)uner systems [9,13,15,18,3234,36,38, 39,5233,60]. 

The generated data may appear confusing at the outset if looked at cursorily. The presence of fillers in the pol)nners seems to show decreases as well as increases in elasticity and the reports may appear contradictory at times. However, a careful look at the elastic properties data of filled pol5mtier systems shows that it is the method of representation and certain categories of fillers which show unexpected trends. The effects of various parameters on the steady sheelastic properties are discussed in various subsections as was done for the steady shear viscous properties in the preceding chapter. However, all subcategories may not be covered and the extent of discussion is at times concise due to limited information. 

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