
328 HIGH PERFORMANCE POLYMERS
improve theuniformity of thefoam and to reduce voids
and other imperfections [52].
14.3 Properties
Most PAIs are injection-moldable,amorphous, ther-
moplastic materials. They absorb water when sub-
jected to humid environments or immersed in water.
Properties of a general-purpose PAI type are given in
Table 14.4.
14.3.1 Mechanical Properties
PAIs exhibit highstrength athigh temperaturesup to
260
◦
C. They exhibit excellent resistance to creep and
wear under these conditions. Therefore, these mate-
rials are used for rotating and sliding components in
automotive and industrial applications, such as bear-
ings and bushings, seal