caa a22 4500 475783018 CHVBK 20180406123650.0 cr unu---uuuuu 170329e20000801xx s 000 0 eng 10.1023/A:1013005707430 doi (NATIONALLICENCE)springer-10.1023/A:1013005707430 Thermal analysis studies of poly(etheretherketone)/hydroxyapatite biocomposite mixtures [Elektronische Daten] [B. Meenan, C. McClorey, M. Akay] Biocomposite formulations which have the potential to combine the proven mechanical performance of poly(etheretherketone) (PEEK) with the inherent bioactivity of hydroxyapatite (HA), may have a utility as load-bearing materials in a medical implant context. The effect of thermal processing on the relevant properties of the PEEK and/or HA components in any fabricated composite structure is, however, an important consideration for their effective exploitation. This paper reports the results of a detailed thermal characterization study of a series of PEEK/HA mixtures using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and modulated differential scanning calorimetry (MDSC). The TGA analyses show minimal weight loss for all of the mixtures and for a pure PEEK sample up to ≈530 °C. Above this point there is a sharp on-set of decomposition for the PEEK component in each case. The temperature at which this feature occurs varies for each mixture in the approximate range 539-556 °C. This observation is supported by the presence of exotherms in the corresponding DSC scans, in the same temperature region, which are also assigned to PEEK decomposition. The temperature at which the degradation on-set occurs is found to decrease with increasing HA contribution. The use of the modulated DSC technique allows a number of important thermal events, not easily identifiable from the data obtained by the conventional method, to be clearly observed. In particular, the glass transition temperature Tg of the polymer can now be accurately determined. Using these thermal analysis data, calculations of the % crystallinity of PEEK in the mixtures have been made and compared with that of a 100% polymer sample. From these studies it is evident that the presence of HA does not adversely affect the degree of crystallinity of the PEEK component in the mixtures of interest over the thermal range studied. Kluwer Academic Publishers, 2000 Meenan B. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut McClorey C. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut Akay M. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/8(2000-08-01), 481-489 0957-4530 11:8<481 2000 11 10856 https://doi.org/10.1023/A:1013005707430 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1013005707430 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Meenan B. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut NATIONALLICENCE 700 1- McClorey C. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut NATIONALLICENCE 700 1- Akay M. Northern Ireland Bio-Engineering Center (NIBEC), School of Electrical and Mechanical Engineering, University of Ulster, Shore Road, Newtownabbey, Co. Antrim, BT37 0QB, Northern Ireland, UK aut NATIONALLICENCE 773 0- Journal of Materials Science: Materials in Medicine Kluwer Academic Publishers 11/8(2000-08-01), 481-489 0957-4530 11:8<481 2000 11 10856 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer