Abstract
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.
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References
A Review of the UK Research Base in Biomaterials (Royal Academy of Engineering, London, 1998).
R&D Priorities for Biomaterials and Implants (Department of Health, London, 1996).
Technology Foresight-Materials Panel Report (Office of Science and Technology, HMSO, London, 1995).
Materials Technology Foresight in Biomaterials (Institute of Materials, London, 1995).
A. RAVAGLIOLI and A. KRAJEWSKI (Eds) “Bioceramics: Materials Properties Applications”, (Chapman & Hall, 1992).
L. L. HENCH, J. Amer. Ceram. Soc. 81 (1998) 1705.
W. N. CAPELLO, J. A. D'ANTONIO, M. T. MANLEY and J. R. FEINBERG, Clin. Orthop. and Related Res. 355 (1998) 200.
M. OGISO, J. Long-Term Effects of Medical Implants 8 (1998) 193.
K. A. HING, S. M. BEST, K. E. TANNER, P. A. REVELL and W. BONFEILD, Proc. Instn. Mech. Engrs, Part H-J. Engin in Med. 212 (1998) 437.
P. C. DAWSON and D. J. BLUNDELL, Polymer 21 (1980) 577.
D. J. BLUNDELL and B. N. OSBORN, ibid. 24 (1993) 953.
R. B. RIGBY, in “Plastics Engineering No. 8” (Marcel Dekker Inc., New York, 1985) p. 299.
M. DAY, J. D. COONEY and D. M. WILES, Polym. Enging Sci. 29 (1989) 19.
Idem. J. Appl. Polym. Sci. 38 (1989) 323.
Idem. Thermochim. Acta 147 (1998) 189.
T. E. ANDRES and I. GRIFFITHS, Proceedings of 1998 SPE Annual West Regional Meeting, Anaheim, CA (Soc. Pet. Eng. Richardson, TX, USA, 1998) pp. 203–7.
S. L. EVANS and P. J. GREGSON, Biomater 19 (1998) 1329.
M. SPECTOR, E. J. CHEAL, R. D. JAMISON, S. ALTER, N. MADSEN, L. STRAIT, G. MAHARAJ, A. GAVINS, D. T. REILLY and C. B. SLEDGE, in Proceedings of 22nd National SAMPE Technical Conference (1990) 1119.
M. AKAY and N. ASLAN, Proc. Instn. Mech. Engrs; Part H-J. Enging in Med. 209 (1995) 93.
Idem. J. Biomed. Mater. Res. 31 (1996) 167.
A. CHOPRA, European Patent Application: 0 790 044 A3 (Howmedica Inc., New York, NY, 10017, USA 14/01/98).
D. F. WILLIAMS, A. MCNAMARA and R. M. TURNER, J. Mater. Sci. Lett. 6 (1987) 188.
K. A. JOCKISCH, S. A. BROWN, T. W. BAUER and K. MERRITT, J. Biomed. Mater. Res. 26 (1992) 133.
C. MORRISON, R. MACNAIR, C. MACDONALD, A. WYKMAN, I. GOLDIE and M. H. GRANT, Biomaterials 16 (1995) 987.
I. B. SEVOSTIANOV, Composite Structures 43 (1998) 109.
A. M. RADDER and C. A. VANBLITTERSWIJK, J. Mater. Sci.: Mater. Med. 5 (1994) 320.
Q. LIU, J. R. DE WIJN and C. A. VAN BLITTERSWIJK, J. Biomed. Mater. Res. 40 (1998) 490.
K. E. TANNER, R. N. DOWNES and W. BONFIELD, Brit. Ceram. Trans 93 (1987) 104.
M. WANG, R. JOSEPH and W. BONFIELD, Biomaterials 19 (1998) 2357.
J. L. DORNHOFFER, Laryngoscope 108 (1998) 531.
J. N. HAY and D. J. KEMMISH, Polymer 28 (1987) 2047.
A. J. RUYS, M. WEI, C. C. SORRELL, M. R. DICKSON, A. BRANDWOOD and B. K. MILTHORPE, Biomaterials 16 (1995) 409.
H. SUDA, M. YASHIMA, M. KAKIHANA and M. YOSHIMURA, J. Phys. Chem. 99 (1995) 6752.
P. CEBE and S.-D. HONG, Polymer 27 (1986) 1183.
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Meenan, B.J., McClorey, C. & Akay, M. Thermal analysis studies of poly(etheretherketone)/hydroxyapatite biocomposite mixtures. Journal of Materials Science: Materials in Medicine 11, 481–489 (2000). https://doi.org/10.1023/A:1013005707430
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DOI: https://doi.org/10.1023/A:1013005707430