12: PARTIALLY AROMATIC POLY(AMIDE)S 285
polyamides show excellent thermal properties with
glass transition temperatures of 124–138
◦
C, melt-
ing temperatures of 306–324
◦
C, and initial degra-
dation temperatures of 410–437
◦
C. Also, good ten-
sile strengths, low-temperature mechanical properties,
low water absorption, and low dielectric constants are
found. The processing windows are wider than those
of traditional semi-aromatic polyamides.
12.2.8 Environmental Friendly
Synthesis
An environmental friendly synthesis method has
been described that has a low wastewater discharge
[26]. The partial aromatic polyamide is obtained as
usual by introducing aromaticdicarboxylic acidand an
aliphatic diamine and the wastewater generated during
the previous prepolymerization ...