Abstract
The solubility of the additives, 2,6- tert-butylphenol, diphenylamine, and phenyl-β-naphthylamine in polyethylene and in aliphatic polyamides differing in amide group content has been studied. Additives were introduced into the polymers through the vapour phase or from saturated solutions in heptane and ethanol at 40°C. The solubilities of both amines change with amide group content in the polymer, passing through maxima near 8 -CONH- groups per 100 C atoms independently of the surrounding medium. The solubility of phenol passes through a maximum if sorption proceeds from its saturated solution in ethanol but monotonously decreases if it occurs from heptane or from the vapour phase. The sorption isotherms follow the Langmuir law at low additive concentrations but markedly deviate from this law at high concentrations. These deviations can be explained by rearrangement of the polymer structure caused by the dissolved compound.
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