Pa. Eriksson et al., INFLUENCE OF IMPURITIES ON MECHANICAL-PROPERTIES OF RECYCLED GLASS-FIBER-REINFORCED POLYAMIDE-66, Polymer engineering and science, 38(5), 1998, pp. 749-756
This work investigates the influences of impurities on the durability
and the reliability of the mechanical properties of recycled glass fib
er reinforced polyamide 66. A critical size-concentration zone could b
e determined based on changes in tensile properties of samples contain
ing untreated glass beads of different size and concentrations, which
were used as simulated impurities in in-plant reprocessed material. Ch
aracterization of samples based on recyclate from post-use radiator en
d-caps, which contained residues of EPDM rubber, showed that the tensi
le strength was almost unaffected by rubber particles up to an equival
ent diameter, d, of similar to 700 mu m However, a significant strengt
h reduction commenced for rubber particles larger than 1200-1300 mu m,
and the strength showed a correlation with d(-1/2). Furthermore, larg
e simulated impurities (425-590 mu m) in in-plant material and rubber
residues in post-use recyclate showed a negative effect on the mechani
cal reliability.