Thermal decomposition of Bayer precipitates formed at varying temperatures

Microstructures and thermal stability of metastable - phase precipitates formed in an Al – Cu alloy at 463

The precipitation behavior in an Al– Cu alloy isothermally annealed at 463 K was studied using Vickers microhardness tests, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). An additional endothermic peak found in the DSC measurements may be attributed to the h00-phase, independent of the dissolution of the G. P. (II) and the h00-phase at the aging temperatures...

Thermal Degradation of Polymers at High Temperatures

Work on thermal ~egradation of poly mers has prev iously been carried out aL lempC'mt ures up to about 500 G. In the present work the range has been extend cd to 850 0 C. Polystyrene was pyrolyzed in a vacuum and also in helium at atmos pheric pressure at 3620 and at 850 0 C. Analysis of t he volatile products indicates that higher temperatures a nd hi~her. pressures cause a greater fragmen tat...

The thermal decomposition of aneurin and co-carboxylase at varying hydrogen ion concentrations.

Decomposition of Oxalate Precipitates by Photochemical Reaction

A photo-radiation method was applied to decompose oxalate precipitates so that it can be dissolved into dilute nitric acid. This work has been studied as a part of partitioning of minor actinides. Minor actinides can be recovered from high-level wastes as oxalate precipitates, but they tend to be coprecipitated together with lanthanide oxalates. This requires another partitioning step for mutua...

Thermal behavior of ethylene/1-octene copolymer fractions at high temperatures: Effect of hexyl branch content

In this work, the effect of hexyl branch content on thermal behavior of a fractionated ethylene/1-octene copolymer with emphasis on high temperatures was investigated. The ethylene/1-octene copolymer was carefully fractionated to different fractions with homogenous hexyl branch (HB) content by preparative temperature rising elution fractionation (P-TREF) method. The P-TREF fractions were therma...