Filled compounds with

Polybutadienes with vinyl contents of 10 7 and 72.4% have been selected for further fatigue-to-failure analysis. Fatigue life measurements have been performed on a large number of specimens by means of the Fatigue-to-Failure Tester (Monsanto). Carbon-black-filled compounds with 50 phr N330 carbon black were cured with conventional curing system at 145°C. Curative levels have been chosen to obtain vulcaniza-tes at several levels of 300% modulus. Fatigue tests were performed on un-notched specimens at room temperature and at several deformation amplitudes. Data discussed here were obtained at 136% strain amplitude. 

In December 2002, the average price of PPS was around 7.70-8.50 per kg. Non-reinforced or pure linear grades are at the upper end of the price spectrum, costing aroimd 15-20 per kg. Highly filled compounds with a glass fibre or mineral content are to the lower end of the price range, while high performanee types are more expensive. 

Because the metal structure is locked by these atoms, the resulting compound is often much harder than the original metal, and some of the compounds are therefore of industrial importance (see under iron). Since there is a definite ratio of holes to atoms, filling of all the holes yields compounds with definite small atom-metal atom ratios in practice, all the holes are not always filled, and compounds of less definite composition non-stoichiometric compounds) are formed. 

Copper(I) forms compounds with the anions of both strong and weak acids. Many of these compounds are stable and insoluble in water. Compounds and complexes of copper(I) are almost colorless because the inner >d orbital of the copper is completely filled. There is a very strong tendency for copper(I) to disproportionate in aqueous solutions into copper(Il) and metallic copper. 

Many other shapes are possible for complexes. The simplest are linear, with coordination number 2. An example is dimethylmercury(O), Hg(CI l,)2 (4), which is a toxic compound formed by bacterial action on aqueous solutions of I Ig ions. Coordination numbers as high as 12 are found for members of the / block, but they are rare in the d block. One interesting type of d-mctal compound in which there are 10 links between the ligands and the central metal ion is ferrocene, dicyciopentadi-enyliron(O), [Fe(C5H5)2] (5). Ferrocene is an aptly named sandwich compound, with the two planar cyclopentadienyl ligands the bread and the metal atom the filling. The formal name for a sandwich compound is a metallocene. 

Hexaborides of a CaBg type are formed by K, the alkaline earths, Y and the larger lanthanides, as well as Th and some actinides ". The crystal structure of these compounds with cubic symmetry (Pm3m, O, ) (see Fig. 1) is characterized by a three-dimensional skeleton of Bg boron octahedra, the interstices of which are filled by metal atoms. The connection between two octahedra is by a B—B bond of length 1.66 X 10 pm, whereas the B—B bond lengths in one octahedron are 1.76 X 10 pm. ... 

Despite more than 200 years of sulfur research the chemistry of elemental sulfur and sulfur-rich compounds is still full of white spots which have to be filled in with solid knowledge and reliable data. This situation is particularly regrettable since elemental sulfur is one of the most important raw materials of the chemical industry produced in record-breaking quantities of ca. 35 million tons annually worldwide and mainly used for the production of sulfuric acid. 

Pico Abrasion Data for Carbon Black Filled NR Compounds with or without QDI... 

The operational-factor tests performed with A1 filled compounds in comparison with A2 filled compounds revealed higher predicted wear resistance and wet traction with the same level of rolling resistance. At the same time the graph of tan 8 versus temperature in Figure 17.6 shows that tan 8 is higher than that of the A2 compound at low temperatures (-20°C). 

With the modern ABS braking system contact temperatures are kept low, particularly on wet surfaces so that the log a v is relatively high and the silica-filled compound is superior to the standard black-filled one. With locked wheel braking the contact temperamres are high and log a-iv values are low, and the ranking of the braking performance of these two compounds reverses. 

FIGURE 30.22 Mixing silica-filled compound Complex modulus versus strain amplitude as modeled with Equation 30.3 typical changes in nonlinear viscoelastic features along the mixing hne. 

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