Nanofiller aggregation as reinforcing mechanism in nanocomposites

Andrea Dorigato, Yuris Dzenis, Alessandro Pegoretti

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A new approach is proposed to model the elastic properties of polymer nanocomposites taking into account agglomeration effects. In particular, the stiffening effect provided by rigid nanoparticles forming primary aggregates is modelled on the hypothesis that part of the polymer matrix is mechanically constrained within the aggregates. To validate the model, linear-low-density polyethylene (LLDPE)/silica micro- and nano-composites have been prepared by melt compounding followed by hot pressing. Electron microscopy observations indicated that the microstructure of the resulting nanocomposites clearly manifested primary aggregation of nanoparticles. Concurrently, thermal calorimetry and X-ray diffraction analyses proved that the crystallization behaviour was not affected by the presence of the filler. Dog-bone specimens have been mechanically tested under uniaxial tension and the data used to validate the model. A good agreement between theoretical predictions and experimental data was demonstrated. The results coupled with the propensity of nanoparticles to form aggregates could explain significant modulus increases in many nanocomposites systems reported earlier.

Original languageEnglish (US)
Pages (from-to)894-899
Number of pages6
JournalProcedia Engineering
Volume10
DOIs
StatePublished - Jan 1 2011

Fingerprint

Nanocomposites
Agglomeration
Nanoparticles
Linear low density polyethylenes
Composite materials
Calorimetry
Hot pressing
Polymer matrix
Electron microscopy
Fillers
Bone
Crystallization
Silica
X ray diffraction
Microstructure
Polymers
Hot Temperature

Keywords

  • Aggregation
  • Modelling
  • Nanocomposites
  • Nanoparticles
  • Polyethylene

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Nanofiller aggregation as reinforcing mechanism in nanocomposites. / Dorigato, Andrea; Dzenis, Yuris; Pegoretti, Alessandro.

In: Procedia Engineering, Vol. 10, 01.01.2011, p. 894-899.

Research output: Contribution to journalArticle

Dorigato, Andrea ; Dzenis, Yuris ; Pegoretti, Alessandro. / Nanofiller aggregation as reinforcing mechanism in nanocomposites. In: Procedia Engineering. 2011 ; Vol. 10. pp. 894-899.
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