Effect of TiO2 nanoparticle loading on Poly(l-lactic acid) porous scaffolds fabricated by TIPS

Aleksandra Buzarovska, Chiara Gualandi, Annapaola Parrilli, Mariastella Scandola

Research output: Contribution to journalArticle

Abstract

Porous nanocomposite scaffolds of poly(l-lactic acid) (PLA), loaded with TiO2 nanoparticles, were prepared by thermally induced phase-separation (TIPS). The preparation procedure induced crystalline polymer structures (with degree of crystallinity up to 51%) with no evidence of residual solvent, as confirmed by thermal analysis. Scaffold porosity, distribution of the nanofiller and shape of the pores were investigated by X-ray micro computed tomography (μ-CT) and scanning electron microscopy (SEM). The produced scaffolds with porosity of 86 ± 2% have interconnected open tubular pores with diameter and length in the ranges 40-80 μm and 200-400 μm respectively. The inorganic TiO2 nano-additive is well dispersed in the scaffold walls, with only a small fraction of micrometric aggregates observable. All investigated polymer scaffolds display similar compressive moduli (between 2.1 and 2.8 MPa). Thermogravimetry (TGA), wide angle X-ray diffraction (XRD) and SEM analyses run on scaffolds subjected to in vitro mineralization tests showed that PLA scaffolds loaded with TiO2 develop an amount of hydroxyapatite four times higher than that of plain PLA, thus assessing that titania nanoparticles confer improved bioactivity to the scaffolds.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalComposites Part B: Engineering
Volume81
DOIs
Publication statusPublished - Aug 15 2015

    Fingerprint

Keywords

  • A. Nano-structures
  • A. Polymer-matrix composites (PMCs)
  • B. Anisotropy
  • D. Electron microscopy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering
  • Mechanical Engineering

Cite this