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Separation of metal halide pairs using Amberlite LA-2 and tri-n-butyl phosphate

III. Separation of silver from cadmium and from zinc

Journal of Radioanalytical and Nuclear Chemistry
Authors:
A. El-Kot
,
A. Ghoneim
, and
A. Alian

Abstract  

Separation factors of silver-cadmium and silver-zinc pairs were determined for Amberlite LA-2 and tri-n-butyl phosphate (TBP) from pure hydrochloric, hydrobromic, sulphuric and orthophosphoric acids as well as from their binary mixtures. The separation of cadmium and zinc from macroamounts of silver can be best achieved from ca. 2M H2SO4. There are many other media suitable for the separation of trace silver from cadmium and zinc matrices.

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Abstract  

The relaxation strength at the glass transition for semi-crystalline polymers observed by different experimental methods shows significant deviations from a simple two-phase model. Introduction of a rigid amorphous fraction, which is non-crystalline but does not participate in the glass transition, allows a description of the relaxation behavior of such systems. The question arises when does this amorphous material vitrify. Our measurements on PET identify no separate glass transition and no devitrification over a broad temperature range. Measurements on a low molecular weight compound which partly crystallizes supports the idea that vitrification of the rigid amorphous material occurs during formation of crystallites. The reason for vitrification is the immobilization of co-operative motions due to the fixation of parts of the molecules in the crystallites. Local movements (Β-relaxation) are only slightly influenced by the crystallites and occur in the whole non-crystalline fraction.

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