Influence rheology

Further factors influencing rheological characterization of filled polymers include changes in the degree of filler dispersion or inter-particle structure forma-... 

Degree of cross-linking and treatment at a pressure in the region 200-400 MPa can strongly influence rheological properties of the milk, which may have interesting implications for products made therefrom. 

The propenies of the solid-liquid or liquid-liquid interfaces are also important. often so important that their influence overshadows any other factor. The contribution of hydrodynamic driven phenomena such as slip Row, secondary flow, edge and end effects, viscous heating, and inertia may also play an important role (see Sec. IV). Good experimental and calculation procedures should ensure either that these factors are absent or that the data are corrected to eliminate their contribution. These will be discussed in Sec. IV. In the following sections, the main physicochemical factors that influence rheological behavior and viscosity are discussed. For the sake of clarity, a distinction will be made between the factors that are related to physical propeities such as composition and particle size, and physicochemical aspects, especially inteifacial properties. 

Small isotropic droplets, c, 1 im or smaller in size, are not easily resolved by microscopy. A minor isotropic component is often found to trail at the lower temperature range within the biphase and its presence can be overlooked [25]. Yet a finely dispersed I phase can be expected to influence rheological behavior, order and orientation dynamics in the mesophase, as well as the mechanical properties of the resulting solid phase. In contrast to microscopy or DSC which detect macroscopic behavior, NMR provides a molecular or segment level view of morphology and cannot distinguish between phase and microphase separation. Thus accurate biphase delineation may be delicate to accomplish. We should further note that the customary dynamic scans do not provide the equilibrium value of biphase width but rather an apparent value as determined by thermal history (section 6.5). 

Monosubstituted POSS have been incorporated into various elastomers such as linear polysiloxanes or hyperbranched polysiloxanes. POSS have also been grafted with other polymers or copolymers, for example, styrene-butadiene-styrene triblock copolymer, which influenced rheological and morphological properties of this copolymer (389). 

The physical properties that influence rheological behavior are internal phase content size, shape, and particle size distribution viscosity and rheological behavior of the continuous phase and temperature. For the case of emulsions two additional parameters, droplet deformabilhy and viscosity of the dispersed phase, should also be considered. 

Under different deformation conditions, natural rubber (NR) may exhibit predominant viscous flow, elastic or viscoelastic behaviour. Thus, the time for the movement of the NR molecular chains, i.e. relaxation time, is vastly affected by those deformation rate and NR types. The variation of NR types such as smoked rubber sheet, rubber blocks such as skim block, STR 5L and STR 20, is another factor that influences rheological properties and processing of NR due to their different Mooney viscosity, molecular weight distribution and gel content. Types of NRs are based on the different production processes of NR in which rubber smoked sheets are produced from NR in the latex form whereas block types are produced from various types of NR sources such as from latex in the case of STR 5L, from rubber scrap in the case of STR 20 and from skim latex in the case of skim block. 

For nonspherical particles such as ellipsoids, two particle-size variables are needed, such as the major and minor semiaxes a and b. Superpositions can be expected for systems of comparable values of the dimensionless axial ratio r = alb. For deformable solid particles, the elastic modulus G governs deformation under shear this requires a new dimensionless group such as the ratio a/G. For emulsions, both the viscosity of the particle and the interfacial tension F will influence rheological behavior. The new dimensionless groups are the viscosity ratio and the stress ratio cta/F. Systems of interacting particles will be characterized by... 

Pigments may also influence rheological properties, which play a vital role in storage and application of coatings. In addition, some... 

Particle size, particle size distribution, and particle shape Influences rheological properties over entire range of shear rates d viscoelastic pr< rties of paste. The particle size, etc., affects tiie particle concentration per unit volume and die rate of flocculation. 

Seshadri, R., Weiss, J., Hulbert, G.J. and Mount, J. 2003. Ultrasonic processing influences rheological and optical properties of high-methoxyl pectin dispersions. Food Hydrocoil. 17 191-197. 

This reaction has implications for the rheological properties of slip agent. The amount of absorbed binder (acrylic acid homopolymer), its pIQ, pH, time, and other additives (dispersant) influence rheological properties." Also, silica particles are able to form ionic associations, and this may be important in the case of inorganic antiblocking agents used in some formulations. 

Afoakwa, E.O., Paterson, A., Eowler, M., 2007. Eactors influencing rheological and textural ojuali-ties of chocolate — a review. Trends Eoxxl Sci. Technol. 18, 290-298. 

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