Mechanical and Flow Properties

The basis for selectivity in affinity chromatography is the use of immobilized biochemicals, known as affinity ligands, that are covalently attached to a support matrix, as illustrated in Figure 2.17. The primary criteria that govern the suitability of a support matrix for affinity chromatography include (1) the mechanical and flow properties of the matrix, (2) the ease of covalent coupling of the ligand to the matrix, and (3) the stability of the... 

H. M. Princen. The mechanical and flow properties of foams and highly... 

The composition and structure of the base EPDM and the sulfonate content of the metal sulfonate-containing EPDM exert substantial effects on the mechanical and flow properties of ionomers. The systems discussed to this point have all contained zinc sulfonate groups. In terms of melt flow the zinc cation is the cation of choice. The metal cation borne by... 

The composition and structure of EPDM and the composition of the ionomer affect the mechanical and flow properties of the ionomer. Another parameter that affects ionomer properties is the concentration of metal acetate, specifically zinc acetate, present in the neutralized sul-fonated EPDM. This is illustrated in Figure 5, where the melt viscosity of zinc sulfonate CR-2504 is plotted as a function of zinc acetate concentration. Zinc acetate was added to a cement of the polymeric acid, and the resultant neutralized polymer was isolated through the solvent flashing of the cement. Essentially all of the zinc acetate that was added to the polymeric free acid was retained by the polymer (cf. Table II). 

M. Sabetzadeh, R. Bagheri, M. Masoomi, Effect of com starch content in thermoplastic staich/low-density polyethylene blends on their mechanical and flow properties. J. Appl. Polym. Sci. 126, E63-E69 (2012)... 

A change in the solid form may lead to a different crystal morphology, which may have an impact on processibility of the drug product due to the different mechanical and flow properties [25], For example, needle-shaped crystals are generally undesirable for pharmaceutical applications since they are difficult to process [26]. 

Rejon A and Alvarez C (1987), Mechanical and flow properties of high density poly-ethylene/low density polyethylene . Polymer Engineering Science, 27,640-646. 

Polymerization reactions. Polymers are characterized by the distribution of molecular w eight about the mean as well as by the mean itself. The breadth of this distribution depends on whether a batch or plug-flow reactor is used on the one hand or a continuous well-mixed reactor on the other. The breadth has an important influence on the mechanical and other properties of the polymer, and this is an important factor in the choice of reactor. 

Silicon—Ca.rbon Thermoset. The Sycar resins of Hercules are sihcon—carbon thermosets cured through the hydrosilation of sihcon hydride and sihcon vinyl groups with a trace amount of platinum catalyst. The material is a fast-cure system (<15 min at 180°C) and shows low moisture absorption that outperforms conventional thermosets such as polyimides and epoxies. Furthermore, the Sycar material provides excellent mechanical and physical properties used in printed wiring board (PWB) laminates and encapsulants such as flow coatable or glob-top coating of chip-on-board type apphcations. 

Although Tyrann-M/E and even conventional membranes are superior to the new polyamide and polyfvinylidene fluoride) membranes with respect to flow rates and filtration capacities, the latter two are more suitable for filtration of most (but not all) organic solvents and, partially as a result of their lower void volumes (Table IV) exhibit mechanical and thermal properties which are generally superior to those of the cellulosics. It should also be noted that in the special case of fiber-reinforced membranes, the mechanical properties are predominantly functions of the embedded fibers rather than of the membrane structu reverse. 

Indices are dimensionless parameters derived from various mechanical and physical properties of the tablet blend and resulting compacts. Mechanical properties typically measured include indentation hardness (kinetic and static), elastic modulus, and tensile strength (10,11). Physical properties include particle size, shape, and size distribution, density (true, bulk, and tapped), flow properties and cohesive properties. 

In this book we consider only fluids that are isotropic, meaning that the fluid properties are independent of direction. By contrast, solids can readily have spatially oriented properties. Consider, for example, a common material like graphite, whose molecular structure has strongly oriented layers. Both mechanical and thermal properties are vastly different normal to and parallel to the layers. While ordinary fluids exhibit no such properties, it is possible to have anisotropic fluids. For example, long-chain polymeric fluids can exhibit properties that are oriented relative to the flow directions. 

FORTRAN computer program that predicts the species, temperature, and velocity profiles in two-dimensional (planar or axisymmetric) channels. The model uses the boundary layer approximations for the fluid flow equations, coupled to gas-phase and surface species continuity equations. The program runs in conjunction with CHEMKIN preprocessors (CHEMKIN, SURFACE CHEMKIN, and TRAN-FIT) for the gas-phase and surface chemical reaction mechanisms and transport properties. The finite difference representation of the defining equations forms a set of differential algebraic equations which are solved using the computer program DASSL (dassal.f, L. R. Petzold, Sandia National Laboratories Report, SAND 82-8637, 1982). 

---