284 HIGH PERFORMANCE POLYMERS
relates the melt viscosity to the polymerization degree.
However, the method is not directly sensitive to the
mole balance. IR spectroscopy is quite suitable for
non-destructive analysis and real-time analysis. Inaddi-
tion, production methods of poly(ester)s have been
reported where the properties of the poly(ester)s are
measured using an IR spectroscopy. The reaction con-
ditions are adjusted according to the measured values.
Instead of TPA, dimethyl terephthalate can be used as
a monomer [10].
12.2.4 Continuous Routes
Processes for the continuous polymerization of PAs
have been described, e.g., in a coil reactor [22]orina
flash reactor [19]. Rapid heating and short residence
times in the high-temperature stage improve the ...