SORPTION OF PHENYL-BETA-NAPHTYLAMINE BY I SOTACTIC POLYPROPYLENE - REARRANGEMENT OF SORPTION CENTERS

The changes in sorption properties of isotactic polypropylene upon dis solution of phenyl-beta-naphtylamine in its melt was studied. Due to t he very low rate of relaxation processes at 40 - 60 degrees C, solvati on shells, which are formed upon dissolution of the above compound in the polymer, do not disappear completely when the dissolved compound i s removed, and some elements of these shells remain in the polymer str ucture. These ''fossils'' of solvation shells are more stable than phe nyl benzoate, a substance of lower molecular mass also formed upon dis solution. Heating the polymer in the absence of the low-molecular-weig ht compound causes these structural changes disappear (slowly at 80 de grees C and quickly at 100 degrees C).