Utilize este identificador para referenciar este registo: https://hdl.handle.net/10216/98344
Autor(es): Guedes, RM
Marina Gomes
Simoes, JA
Título: DMTA analysis for long-term mechanical behaviour prediction of PMMA-based bone cements
Data de publicação: 2006
Resumo: Poly(methyl methaerylate) (PMMA) is commonly used as acrylic bone cement to fix bone implants. In vivo degradation of bone cement may lead to a decrease in mechanical properties and result in aseptic loosening. Creeping can promote failure of the implant. This study used dynamic mechanical thermal analysis (DMTA) equipment, in the 0.01 to 50 Hz frequency range, to investigate the dynamic viscoelastic relaxation characteristics of CMW (TM), PROFIT QUIRURGICO and PALACOS PMMA-based bone cements. Their initial moduli were measured as 2450, 1850 and 1710 MPa, respectively. Relaxation master curves displayed similar features. The DMTA temperature range was between 20 and 75 degrees C. Predictions for long-term relaxation moduli were analyzed and compared against published experimental data. The comparison revealed that master curves obtain using the time-temperature-superposition principle (TTSP) present a much slower relaxation modulus compared to long-term experimental data above 1000 s. However, extrapolations based on a time-power law applied to isothermal experimental data allow better long-term predictions.
Assunto: Biotecnologia ambiental
Environmental biotechnology
Áreas do conhecimento: Ciências da engenharia e tecnologias::Biotecnologia ambiental
Engineering and technology::Environmental biotechnology
URI: https://hdl.handle.net/10216/98344
Tipo de Documento: Artigo em Revista Científica Internacional
Condições de Acesso: restrictedAccess
Aparece nas coleções:FEUP - Artigo em Revista Científica Internacional

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
58057.pdf
  Restricted Access
500.74 kBAdobe PDF    Request a copy from the Author(s)


Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.