FORMATION AND ELIMINATION OF CENTERS OF SORPTION OF SMALL MOLECULES IN ISOTACTIC POLYPROPYLENE

At sufficient high amount of phenyl benzoate dissolved in the melt of isotactic polypropylene, the structure of the polymer changes. New additional centers of sorption arise which are capable to absorb other low-molecular compounds. At temperatures below 60-degrees-C these centers remain in the polymer even if phenyl-benzoate is removed; however, they disappear at temperatures higher than 80-degrees-C.