Particles with varying content

Note that, apart from the filler particle shape and size, the molecular mass of the base polymer may also have a marked effect on the viscosity of molten composites [182,183]. The higher the MM of the matrix the less apparent are the variations of relative viscosity with varying filler content. In Fig. 2, borrowed from [183], one can see that the effect of the matrix MM on the viscosity of filled systems decreases with the increasing filler activity. In the quoted reference it has also been shown that the lg r 0 — lg (MM)W relationships for filled and unfilled systems may intersect. The more branches the polymer has, the stronger is the filler effect on its viscosity. The data for filled high- (HDPE) and low-density polyethylene (LDPE) [164,182] may serve as an example the decrease of the molecular mass of LDPE causes a more rapid increase of the relative viscosity of filled systems than in case of HDPE. When the values (MM)W and (MM)W (MM) 1 are close, the increased degree of branching results in increase of the relative viscosity of filled system [184]. 

When the DMAEMA content of NVP - DMAEMA copolymers was reduced from 20% to 8%, the silica fines stabilization effectiveness appeared to improve slightly. When the 80/20 NVP - DMAEMA copolymer was converted to a terpolymer containing 8% DMAEMA (CH SO, silica fines stabilization was substantially unaffected. However, stabilization of silica/kaolinite fines was greatly improved. This suggested that the interaction of polymer quaternary nitrogen atoms with anionic sites on mineral surfaces was important for the stabilization of migrating clays but a different interaction was important for the stabilization of silica fines. Calcite fines stabilization improved while hematite fines stabilization effectiveness decreased. This also indicated the nature of the adsorbed polymer - fine particle complex varied for different minerals. 

Particle size. The material handling properties of solid wastes are dependent upon particle size. This appfies as well to feed preparation and air pollution control which are affected by solid-waste particle size and cohesiveness. For wastes such as bulk soils, the amount of fines (from clay and silt) is critical for system design. Cohesiveness, which varies with moisture content, is important for Din and conveyor design. 

Binary mixtures were prepared with varying drug contents (60, 70, 80, 90, and 95%) keeping constant the drug and excipient particle size. Table 24 gives the composition of the studied batches as well as the tablet thicknesses. The mixtures were compressed on an eccentric machine (Bonals A-300) without any further excipient. Cylindrical tablets with a mean dosage of 500 mg and a diameter of 12 mm were prepared at the maximum compression force accepted by the formulations. 

Figure 5-2 Illustration of the Processing Steps in Tomato Concentrates Finisher Screens with Different Diameter Openings were Used to Vary Pulp Particle Size and Content (Tanglertpaibul and Rao, 1987a).

Roylance et al. studied yielding at temperatures between 0 and 75 °C in AMBS polymers, which are poly (styrene-acrylonitrile-methyl methacrylate) copolymers containing polybutadiene particles, and showed that Eq. (5) is obeyed over three decades of strain rate ). Nominal mbber contents varied between 0 and 13%, and the slopes of the Eyring curves changed with rubber content in the direction predicted by Eq. (8). As mbber phase volumes are not given, the data cannot be... 

Yeadou, D.A., Daona, C. . T.. Cooper, A.S, uid Reeves, W.A. (1971), I nsec (-resistant packaging. Effectiveness of fabric Ireatment varies with oil content, particle size is improved by PVC barrier. Modern Packaging Sept., 54 57. 

The definition of the term nanoparticles varies significantly depending on the scientific community where it is used. While in material sciences, the prefix nano is generally restricted to structures smaller than 10 nm or, at the most, 100 nm, the same term in pharmaceutical sciences may refer to particles with up to 1000 nm in diameter. However, when dealing with nanoparticles, there is general agreement on the phase state of the particles themselves which are supposed to be solid and dispersed in a continuous solid or fluid medium. In the following, we stick to a nomenclature that is common in pharmaceutical applications and has been proposed by Kreuter spherical nanoparticles with a compact solid structure are referred to as nanospheres, while hollow nanoparticles with a fluid content are named nanocapsules. 

Synthesis was carried out of the copolymers of 4-vinylpyridine (4VP), styrene (St) and divinylbenzene (DVB) with varied compositions, P(4VP-St-DVB), by suspensionpolymerisationusing 2,2 -azobisisobutyronitrile (AIBN) as an initiator. Preparation of the insoluble (crosslinked) pyridinium-type polymers in benzyl-pyridinium bromide form, which possess various macromolecular chain compositions, was performed by the reaction of eachP(4VP-St-DVB) with benzyl bromide (BzBr), respectively. By using different halohydrocarbon RX in the quatemisation of P(4VP-St-DVB), the insoluble pyridinium-type polymers with various pyridinium group stractures were obtained. FTIR was nsed to identify the stractures of P(4VP-St-DVB) and its quatemised product Q-P(4VP-St-DVB). The 4VP content in each copolymer P(4VP-St-DVB) was measured by non-aqueous titration and the pyridinium group content (Cq) in each Q-P(4 VP-St-DVB) sample was determined by means of the back titration manner in argentometiy and/or the elemental analysis method, respectively. Also, the particle structure... 

The morphology of ruber modified epoxy photopolymers was found to depend on the cure conditions as well as the nature and concentration of rubber. The commercially available acrylonitrile-butadiene copolymer rubber modifiers with varying percentages of acrylonitrile content were used. They were polymerized using a photocationic initiator involving a UV exposure followed by a thermal cure. Transmission electron micrographs of osmium tetroxide stained specimens, coupled with dynamic mechanical measurements indicated that phase separation and particle size distribution depended not only on rubber concentration and compatibility, but also on the cure conditions. 

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