Effect of moisture and filler content on the structural, thermal and dielectric properties of polyamide-6/boehmite alumina nanocomposites

Georgia N. Tomara, Panagiota K. Karahaliou, Dimitris L. Anastassopoulos, Stavroula N. Georga, Christoforos A. Krontiras, Jozsef Karger-Kocsis

Research output: Contribution to journalArticle

Abstract

Polyamide-6 (PA-6)/boehmite alumina (BA) nanocomposites were prepared via direct melt compounding. Structural, thermal and dielectric properties of ‘as-received’ (including moisture) and ‘dried’ (thermally treated) specimens were examined. The BA nanofiller was homogeneously dispersed in the PA-6 matrix. XRD and FTIR revealed that crystallization of PA-6 in the γ phase was favoured over α phase with increasing BA content. The crystallinity index (CI) and the percentage of α and γ phases were also evaluated. Dried specimens exhibited a lower CI than as-received specimens while the CI decreased with the addition of filler. Broadband dielectric spectroscopy revealed the presence of γ, β and α relaxations, the Maxwell–Wagner–Sillars effect and the contribution of conductivity relaxation in the as-received samples. The drying procedure unmasked a double feature of both β and α modes. The results of the complementary techniques were analysed and the effects of moisture and/or the incorporation of BA nanofiller on the microstructure of the PA-6 matrix are disclosed.

Original languageEnglish
Pages (from-to)871-885
Number of pages15
JournalPolymer International
Volume68
Issue number5
DOIs
Publication statusPublished - May 2019

Keywords

  • boehmite alumina
  • dielectric spectroscopy
  • nanocomposites
  • polyamide-6
  • structural characterization
  • thermal analysis

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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