EFFECT OF ANIONS ON REACTIONS PROMOTED BY ALUMINUM SALT-SOLUTIONS ON THERMALLY AGED PAPER

Tile effect of different aluminium salt solutions on the wet strength and degradation of paper after thermal treatment is described. Tensile measurements indicate that different anions affect the reaction of al uminium cations in paper, altering the ratel and degree of each reacti on. Although both reactions under investigation are acid catalysed, th e effects different anions exhibit can be explained only by reference to the solution chemistry of aluminium, and not to formal measurements of acidity.