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From the analysis of these curves shows that with increasing multiplicity of pro-
cessing an ultrasound helps reduce the À ow temperature of PP. Furthermore, it should
be noted that the ultrasonic treatment leads to recovery of macromolecules of the poly-
mer, as without ultrasound PP at 180ºC (fourth cycle) is irreversibly destroyed due to
an increase in the number of defects in the sample when it is repeated processing, and
PP treated with ultrasound is not destroyed by this temperature is due to the restoration
of macromolecules under the inÀ uence of ultrasonic vibrations.
Since a mixture of PP and PET were obtained at the treatment temperature of last,
then further studies were carried out À ow curves of PP treated with or without ultra-
sound at 265ºC. Figures 6 and 7 show the À ow curves of PP at 230 and 265ºC.
FIGURE 6
The curves of flow of the first cycle of processing of PP at 230°C.
FIGURE 7
The curves of flow of the first cycle of processing of PP at 265
o
C.
At the temperature 230
o
C, the À ow curves of PP treated with ultrasound and with-
out it are in the area of the con¿ dence interval. At a temperature of 265
o
C, values of
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