Properties Research of Secondary Polymeric Materials on the Basis of Polypropylene and Polyethylene Terephthalate Got Under the Influence of Ultrasonic Oscillations on Polymeric Melt - Progress in Organic and Physical Chemistry: Structures and Mechanisms - page 150

FIGURE 2 Dependence of polyethylene terephthlate's melt's flow index on the amount of
processing cycles.

Conducted researches of melt's À ow index of PET processed with ultrasonic vibro
attachment and without it (Figure 2) showed that melt's À ow index increases from
cycle to cycle. This indicates destructive processes in PET, polymer changed its color
from white to putty with the growth of processing's multiplicity.
Tests to determine density showed that the density of PP obtained with ultrasound
and without it, virtually unchanged throughout the treatment cycles. The density of
polyethylene in both cases is greatly reduced after the ¿ rst cycle of treatment, and the
next three cycles vary slightly.
Figure 3 shows the relative values of the absorption bands of PET groups on the
number of cycles of treatment.

FIGURE 3 (Continued)