The influence of hydroxyapatite (HA) microparticles (m) and nanoparticles (n) on the thermal and dynamic mechanical properties of poly-L-lactide

Samuel I. J. Wilberforce*, Christopher Edward Finlayson, Serena M. Best, Ruth E. Cameron

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Citations (SciVal)

Abstract

In this paper, we explore the effects of hydroxyapatite microparticles and nanoparticles on the thermal and dynamic mechanical properties of injection moulded bioresorbable poly-L-lactide/hydroxyapatite composites intended for use in orthopaedics. The T(g) of the nanocomposites were lower than those of the microcomposites. This was thought to be due to the larger surface area of well dispersed nanoparticles in the polymer matrix, leading to a larger interfacial area. The as-moulded composites were largely amorphous, however, during thermal analysis the polymer in the nanocomposites crystallized more and had lower cold crystallization temperature than that in the microcomposites since the nanoparticles acted as more effective nucleating agents. The storage moduli at 37 degrees C of the nanocomposites were higher than those of the microcomposites. The storage moduli of the composites approached the lower range of storage modulus for cortical bone and may prevent stress shielding during bone regeneration. Crown Copyright (c) 2011 Published by Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2883-2890
Number of pages8
JournalPolymer
Volume52
Issue number13
Early online date22 Apr 2011
DOIs
Publication statusPublished - 08 Jun 2011

Keywords

  • Storage modulus
  • Hydroxyapatite
  • VISCOELASTIC BEHAVIOR
  • TRANSITION TEMPERATURE BEHAVIOR
  • BONE
  • COMPOSITES
  • DEGRADATION
  • CRYSTALLIZATION BEHAVIOR
  • NANOCOMPOSITES
  • GLASS-TRANSITION
  • Poly-L-lactide

Fingerprint

Dive into the research topics of 'The influence of hydroxyapatite (HA) microparticles (m) and nanoparticles (n) on the thermal and dynamic mechanical properties of poly-L-lactide'. Together they form a unique fingerprint.

Cite this