debatable changes in mechanical film properties and
discoloration. Several studies on thermal aging of polymers in
presence of iron show an increase of thermal, photo- and biodegradability
[56,57]. Nakatani and Blakey stated two different
impacts of iron. Iron increases or hinders degradation, depending
on the distance from the iron particle [58,59]. When applied at
polyamide iron is reported to increase the thermal stability