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  • Aging of polyetheretherketone (PEEK) and polyphthalamide (PPA) in polar and non-polar lubricant base oils [Elektronski vir]
    Ferreira, Pedro Martins ; Trindade, Bruno ; Kalin, Mitjan
    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.
    Vir: Polymer testing [Elektronski vir]. - ISSN 1873-2348 (Vol. 131, [article no.] 108342, Feb. 2024, str. 1-12)
    Vrsta gradiva - e-članek ; neleposlovje za odrasle
    Leto - 2024
    Jezik - angleški
    COBISS.SI-ID - 186548483

    Povezava(-e):

    https://www.sciencedirect.com/science/article/pii/S0142941824000199
    Repozitorij Univerze v Ljubljani – RUL
    DOI

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