1.1 Influence of heat treatment on polyethyleneterephthalate (PET)
■Explanation
PET bottle was measured by DSC. With the original
sample, the peak by melting is mainly observed at 254.8 ˚C.
It shows that the structure before heating was crystalline.
On the other hand, as for DSC (2nd-heating) of an
original sample which is cooled rapidly after heating,
glass transition is observed at 77.6 ˚C. Because the glass
transition occurs in a non-crystalline solid, it turns out
that the PET becomes non-crystalline when it is cooled
rapidly. The exothermic peak at 136.8˚C means that the
non-crystalline PET changes to the crystalline PET at this
temperature.
■Analytical Conditions
Instrument : DSC-60
Sample : PET
Sample Amount : 6.72mg
Atmospheric Gas : N2
Flow Rate : 50mL/min
[Temperature Program]
Heating Rate :