286 HIGH PERFORMANCE POLYMERS
a dendritic polyester resin. The inclusion of only 0.5%
of a dendritic polyester resin can increase the melt flow
rate by as much as 100% [32].
Compatibilizing agent for blends of PAE and par-
tially aromatic PA resins is citric acid, fumaric acid, or
maleic anhydride [33]. Compatibilization is achieved
in a twin-screw extruder by melt mixing.
12.2.10.3 Poly(amide)—Poly(amide)
Blends
PAs using only crystalline PAs as a polymeric
matrix exhibit insufficient weld strength due to their
crystallinity when subjected to welding. The weld
strength with respect to various welding methods can
be improved by adding small amounts of amorphous
partially aromatic PA to crystalline PA types [34,35].
The properties of the blends can be still ...