Impact of the heating/quenching process on the mechanical, optical and thermodynamic properties of polyetheretherketone (PEEK) films

Bodden, Lisa; Lümkemann, Nina; Köhler, Valerie; Eichberger, Marlis und Stawarczyk, Bogna (2017): Impact of the heating/quenching process on the mechanical, optical and thermodynamic properties of polyetheretherketone (PEEK) films. In: Dental Materials, Bd. 33, Nr. 12: S. 1436-1444

Abstract

Objective. The aim of this study was to investigate the impact of a heating/quenching process on the optical, mechanical and thermodynamic properties of filled (20%_4000) and unfilled PEEK films (0%_2000 and 0%_4000). Heating/quenching was performed to simulate thermo-forming as possible method to process thermoplastic polymers for dental application. Methods. For the investigation, films of different PEEK qualities (0%2000, 0%_4000, 20%_4000) were produced using isostatic pressing (n = 10/quality). From each PEEK film, round specimens (n = 20/PEEK film) with a diameter of 34 mm were cut and following parameters were determined: translucency (T%), Martens-Hardness (HM), indentation modulus (E-rr), glass transition temperature (T-G), melting temperature (T-M) and enthalpy of fusion (Delta H-f). Same specimens were exposed to heating/quenching using defined parameters. Afterwards, T%, HM, E-IT, TG, TM and Delta H-f were determined again. Data were analysed using Kolmogorov-Smirnov test, univariate ANOVA followed by post-hoc Scheffe test with partial eta squared (eta p(2)), Kruskal-Wallis and Mann Whitney U test. Level of significance was defined to 95%. Results. Materials showed significant differences for all investigated parameters in the initial state, except of T-G (p = 0.249). The heating/quenching process showed a significant increase on T% for the unfilled materials 0%2000 and 0%_4000. HM and E-IT decreased significantly through heating/quenching for all materials. Moreover, heating/quenching showed a reduction of T-G for 0%2000 and 20%-4000, while T-M decreased for 0%2000 and 0%_4000. Delta H-f confirms different crystallinities of tested materials. Significance. The heating/quenching process showed a significant impact on all investigated parameters. The highest impact was found for mechanical properties resulting in decreased values of HM and E-IT. (C) 2017 The Academy of Dental Materials.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0109-5641
• Sprache: Englisch