Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles

D. Pedrazzoli, V. M. Khumalo, J. Karger-Kocsis, A. Pegoretti

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Effects of nanofiller concentration and surface treatment on the morphology, thermal, viscoelastic and mechanical behavior of polypropylene copolymer (PP)/boehmite alumina (BA) nanocomposites were investigated. Both untreated BA particles and those treated with octylsilane (OS) or sulphonic acid compound (OS2) were added at up to 10 wt% to produce nanocomposites by melt mixing followed by film blow molding and hot pressing. Dispersion of BA was studied by scanning electron microscopy. Differential scanning calorimetry and wide-angle X-ray scattering were adopted to detect changes in the crystalline structure of PP. Thermooxidative degradation of the nanocomposites was assessed by thermogravimetrical analysis. Dynamic mechanical analysis served for studying the viscoelastic properties, whereas quasi-static tensile, creep and Elmendorf tear tests were used to detect changes in the mechanical performance. BA nanoparticles were finely dispersed in PP up to 10 wt%, even when they were not surface modified. The resistance to thermal degradation was markedly improved by BA nanomodification. Since the crystalline characteristics of the PP matrix did not practically change with BA modification, changes observed in the mechanical properties were attributed to BA dispersion, filler/matrix interactions and related effects.

Original languageEnglish
Pages (from-to)92-100
Number of pages9
JournalPolymer Testing
Volume35
DOIs
Publication statusPublished - 2014

Fingerprint

Aluminum Oxide
Polypropylenes
Alumina
Nanoparticles
Copolymers
Nanocomposites
Crystalline materials
Sulfonic Acids
Dynamic mechanical analysis
Hot pressing
Blow molding
aluminum oxide hydroxide
Hot Temperature
X ray scattering
Surface treatment
Fillers
Differential scanning calorimetry
Creep
Pyrolysis
Degradation

Keywords

  • Boehmite alumina
  • Mechanical properties
  • Morphology
  • Nanocomposite
  • Tear resistance
  • Thermal properties

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Thermal, viscoelastic and mechanical behavior of polypropylene with synthetic boehmite alumina nanoparticles. / Pedrazzoli, D.; Khumalo, V. M.; Karger-Kocsis, J.; Pegoretti, A.

In: Polymer Testing, Vol. 35, 2014, p. 92-100.

Research output: Contribution to journalArticle

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