Thermo-mechanical properties of poly ε-caprolactone/poly l-lactic acid blends

Addition of nalidixic acid and polyethylene glycol additives

P. Douglas, Ahmad B. Albadarin, Ala'a H. Al-Muhtaseb, Chirangano Mangwandi, G. M. Walker

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The search for ideal biomaterials is still on-going for tissue regeneration. In this study, blends of poly ε-caprolactone (PCL) with poly l-lactic acid (PLLA), nalidixic acid (NA) and polyethylene glycol (PEG) were prepared. Mechanical and thermal properties of the blends were investigated by tensile and flexural analysis, DSC, TGA, WXRD, MFI, BET, SEM and hot stage optical microscopy. Results showed that the loading of PLLA caused a significant decrease in tensile strength and almost total eradication of the elongation at break of PCL matrix, especially after PEG and NA addition. Increased stiffness was also noted with additional NA, PEG and PLLA, resulting in an increase in the flexural modulus of the blends.Isothermal degradation indicated that bulk PCL, PLLA and the blends were thermally stable at 200. °C for the duration of 2. h making extrusion of the blends at this temperature viable. Morphological study showed that increasing the PLLA content and addition of the very low viscosity PEG and powder NA decreased the Melt Flow Indexer and increased the viscosity.At the higher temperature, the PLLA begins to soften and eventually melts allowing for increased flow and, coupling this with, the natural increase in MFI caused by temperature is enhanced further. The PEG and NA addition increased dramatically the pore volume which is important for cell growth and flow transport of nutrients and metabolic waste.

Original languageEnglish
Pages (from-to)154-165
Number of pages12
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume45
DOIs
Publication statusPublished - May 1 2015

Fingerprint

Nalidixic Acid
Lactic acid
Polyethylene glycols
Lactic Acid
Mechanical properties
Acids
Viscosity
Tissue regeneration
Cell growth
Biocompatible Materials
Biomaterials
Powders
Temperature
Nutrients
Optical microscopy
Extrusion
polycaprolactone
Elongation
Tensile strength
Thermodynamic properties

Keywords

  • Mechanical properties
  • Poly l-lactic acid
  • Poly ε-caprolactone
  • Polyethylene glycol
  • Thermal properties
  • Topography

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

Cite this

Thermo-mechanical properties of poly ε-caprolactone/poly l-lactic acid blends : Addition of nalidixic acid and polyethylene glycol additives. / Douglas, P.; Albadarin, Ahmad B.; Al-Muhtaseb, Ala'a H.; Mangwandi, Chirangano; Walker, G. M.

In: Journal of the Mechanical Behavior of Biomedical Materials, Vol. 45, 01.05.2015, p. 154-165.

Research output: Contribution to journalArticle

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