SORPTION OF CONGO RED IN POLYVINYL-FORMAL

(II) CONCEANING THE FORMALIZED FILM OF HEAT-TREATMENT OF P. V. A.

Abstract

Heterogenous formalization reaction of heat treated P. V. A. film was studied.
How the distribution of formalization degree in film changed during reaction was first considered.
Sorption isotherms of congo red in P. V. F. films (15, 21, 32, 39, 43 mol%) were studied. The amount of sorbed dye is represented by D_s as described before.
The results of similar tendency as previously reported (I) were obtained.