Recently [8], the kinetics of isothermal crystallization of
poly(ethylene terephthalate) has been measured by TA-FTIR by
separating the crystalline and amorphous components of the car-bonyl absorption bands as a function of time over a range of
temperatures. This enabled the weight fraction crystallinity to be
measured well into the secondary crystallization process over a
greater time scale and wider temperature range than was possible by differential scanning calorimetry, DSC. The later technique
by measuring the rate of crystallization rather than the fractional