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High impact polystyrene modified with various flame retardants (decabromodiphenyl ether, hexabromocyclododecane, antimony trioxide) and other additives has been prepared. The ageing behaviour and the permanence of the flame retardance were tested. The ageing processes did not ap?reciably affected the flammability characteristics of the flame retardant high impact polystyrenes although other important material properties (impact strength, gloss, colour) were already considerably deteriorated.

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The effect of titanium compounds on the oxidative degradation of cis‐1,4‐polyisoprene has been widely restricted by transformation of titanium to its tetravalent form and by its stabilization in the higher valency state. With regard to the oxidative degradation of polymer, titanium(IV) oxide and titanium(IV) complex with hydrazine can be considered inactive compounds. The peroxidic intermediate products and the free radicals which are formed by oxidation of titanium(III) chloride and of the organoaluminum components of the Ziegler catalyst initiate the oxidative degradation and the crosslinking of the polymer. Mechanism of the decomposition of the Zeigler catalyst by oxygen, lead(IV), acetate, or hydrazine has been proposed.

No abstract