Abstract
Two types of poly-para-phenylene (PR-120 as an extrusion and PR-250 as an injection moulding grade) were previously investigated with regard to their thermal, rheological and mechanical properties. In the last part of this paper series, the tribological properties, in particular the scratch resistance and wear under abrasive, sliding and rolling conditions, were evaluated as a function of the materials' molecular characteristics. In general, PR-120 exhibited a better scratch and wear resistance, which is expected due to its higher molecular weight. However, other factors also seem to play an important role, although convincing correlations between the scratch and wear behaviour and the morphological and mechanical properties could not be found so far. All the properties tested were mirrored to those of polyetheretherketone and other polymers tested under similar conditions.