These observations refer specifically to experimental studies of the rates of thermolysis of azoalkanes. It is generally believed that polar effects are absent from the transition states of these reactions so that these reflect the relative stabilities of the radicals themselves. ( 6) Various attempts to rationalize the interesting relationship between the conformation of a radical center and the nature of an a substituent have appeared in the literature. For example, see: M.
The application of microwave heating for the separation of stabilizers from polypropylene and polyethylene was studied. Additives examined were the antioxidants IRGANOX 1010 and IRGAFOS 168 and the light stabilizer CHIMASSORB 81. The polymer samples were kept in sealed vessels and irradiated in a laboratory microwave oven. Fairly quantitative (> 90% of the expected content) extraction of the stabilizers from powdered polymer was achieved within 3 to 6 minutes using 1,l ,1-trichloroethane or the 1 : 1 mixture of acetone and n-heptane as the extracting solvent.
ZUSAMMENFASSUNG:Die Abtrennung von Stabilisatoren aus Polypropylen und Polyethylen mit Hilfe des Mikrowellenheizens wurde untersucht. Die untersuchten Additive waren die Antioxidantien IRGANOX 1010 und IRGAFOS 168 und das Lichtschutzmittel CHIMAS-SORB 8 1. Die Polymerproben wurden in geschlossenen GefaDen in einem Laboratoriumsmikrowellenherd bestrahlt. Eine nahezu quantitative Extraktion (> 90% des erwarteten Gehalts) der Stabilisatoren aus dem gepulverten Polymer wurde innerhalb von 3 -6 min mit l,l,l-Trichlorethan oder einer 1 : 1-Mischung aus Aceton und n-Heptan erzielt.
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