High-content leads

Yamada T et al (1982) Piezoelectricity of a high-content lead zirconatetitanate/polymer composite. J Appl Phys 53 4328-4332... 

T. Yama T. Ueda, and T. Kilayama, Piezoelectricity of a high-content lead zirconate titaoate/polymer composite. 3. nys 53 4328 (19 ). 

The consideration that many zeolite types exist, each with many tunable properties (e.g., pore size and alumina content), leads not only to a wealth of options but also to a high level of complexity. Owing to this complexity and limited understanding of zeolite formation and permeation behavior, a lot of experimental effort is required in this field, slowing down developments toward successful application. 

These examples illustrate that, for many materials, the water content can be relatively high without leading to any material instability dmring shelf life, which depends on the water-bonding capacity of the material. When water is strongly retained, the water activity and thus the amount of free water will be low. It must be mentioned that this is quite contradictory to some former and still presently reported assumptions that the water content of CRMs should generally not exceed a rather low value, e.g. around 3 % for long-term stability of RMs. 

When the post-coagulation sludge is added to hydrolyzate production, then the iron hydroxide is converted into ferric sulfate, which is well soluble in water. Too high content of soluble iron compounds, which are easily absorbable, should be avoided, as the excessive amount of the iron in the diet is harmful [13]. It leads to some disease like hemochromatosis or siderosis. Thus, the aim of our research was to find a method of decreasing the absorbable iron content of fish silage. 

A product of this type will have over 50% of its weight derived from maleic anhydride. This very high content of reactive double bonds will lead to a very brittle solid when it is cross-linked with styrene. Without further modification, this solid material will have very high tensile moduli, probably over 600 kpsi, but a very low tensile elongation, way below 1 %. Such a brittle material obviously has only very limited applications. Thus, for most general-purpose applications, it is necessary to incorporate some chemically inert components to soften the polymer backbone. This will reduce the cross-linking density and improve the physical properties of the cured solid. 

Of course, in all these cases, the influence of the always-present modulator water cannot be neglected. Its influence increases with decreasing polarity of the added modulator. Even with high modulator concentrations such as those used in the case of n-butanol or ethyl apetate. insuffl-cient control of the water content leads to loss of reproducibility and especially to unpredictable selectivities 61). 

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