ADSORPTIVE PROPERTIES OF SYNTHETIC RESINS. PART IV.

The adsorption of homologous series of mono- and dibasic aliphatic acids by acid- and alkali- condensed phenolic resins, amino- and protein resins has been studied. The reversal of Traube's rule in the case of alkali-condensed, amino- and protein resins is explained on the basis of orientation of molecules at the resin-solvent surface according to the theory put forward by Langmuir and. Harkins. The influence of various substituents on adsorption has also been studied. The adsorption by ammonia-condensed amino- and protein resins increases with the introduction of COOH, OH, CN, Cl, Br. The NH₂ and alkyl groups cause a decrease in adsorption.

The results obtained in the case of acid phenolic resins are quite the opposite to those in basic resins. This is probably due to the fact that acid resin is less polar than water. In non-polar solvents results are in line with those obtained in basic resins.