
288 HIGH PERFORMANCE POLYMERS
In the course of thermo-oxidative degradation of
PAs stabilized with antioxidants, such as phenols and
secondary aromatic amines and hindered nitroxy rad-
icals chemiluminescence is observed [46]. This effect
is attributed to redox inhibition reactions.
During the last few years, therehas emerged astrong
demand for the development of polyamides witha high
melting point, which would further beneficially exhibit
a high heat deflection temperature, an increased heat
resistance, and increased melt stability, while retain-
ing good moldability and excellent dimensional sta-
bility as well as attractive cost characteristics [47].