20.500.12556/RUL-154703 Aging of polyetheretherketone (PEEK) and polyphthalamide (PPA) in polar and non-polar lubricant base oils The lubrication of high-performance polymers allows the more widespread use of these materials in mechanical systems. This work aims to study the compatibility of polyetheretherketone (PEEK) and polyphthalamide (PPA) with polar and non-polar lubricant base oils by inducing aging. Polymer discs were kept immersed in two polar synthetic esters, i.e., propylene glycol ester (PG) and trimethylolpropane ester (TMP), as well as in a non-polar synthetic oil, polyalphaolefin (PAO). Aging was carried out at room temperature and at 100 °C for 30 days. Samples were also aged in air at 100 °C to differentiate the effects of chemical and thermal aging. The chemical, morphological, thermal and mechanical properties of the aged samples were measured and compared to the unaged material. The results for aging in oils at 100 °C show the appearance of carbonyl-containing groups on the surfaces of both polymers, with consequent changes in their surface free energy, and an increase in the crystallinity and microhardness. The diffusion of oil molecules induced the oxidation of the polymers. PEEK was less affected by aging than PPA. The aging in PG ester at 100 °C revealed more pronounced effects among all the oils because of its polarity and its smaller molecule size, which led to an easier diffusion into the polymer matrix and plasticization. polyetheretherketone polyphthalamide lubricants PAO esters aging polietereterketon poliftalamid maziva PAO estri staranje true false true Angleški jezik Slovenski jezik Članek v reviji 2024-02-23 10:54:54 2024-02-23 10:54:57 2024-12-04 15:13:44 0000-00-00 00:00:00 2024 0 0 12 str. Vol. 131, art. 108342 Feb. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.892 1873-2348 10.1016/j.polymertesting.2024.108342 186548483 Ferreira,_Trindade,_Kalin-Aging_of_polyetheretherketone_(PEEK)_and_polyphthalamide_(PPA)_in_polar_and_non-polar_lubricant_base_oils.pdf Ferreira,_Trindade,_Kalin-Aging_of_polyetheretherketone_(PEEK)_and_polyphthalamide_(PPA)_in_polar_and_non-polar_lubricant_base_oils.pdf 1 EAF1D12DD879ACF1A27CC6AB4508BA87 c9330305885e94e7b5d8a087178fd6855cdb3adf178c4fa0414018868f879aed 341ea1e7-d233-11ee-9607-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181235 https://www.sciencedirect.com/science/article/pii/S0142941824000199 1 99352d6e-d231-11ee-9607-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181233 Fakulteta za strojništvo 0 0 0