On depression of glass transition temperature of epoxy nanocomposites

Gang Liu, Hui Zhang, Dai Jun Zhang, Zhong Zhang, Xue Feng An, Xiao Su Yi

Research output: Journal PublicationArticlepeer-review

24 Citations (Scopus)

Abstract

Epoxy composite materials filled with nanoalumina particles were prepared by mechanical mixing techniques. The glass transition temperatures (T g) of the nanocomposites were found to decline significantly with the increasing filler content. After the addition of 30-phr nanoparticles, the T g of the filled sample decreased by as high as 55 °C, as compared with that of the neat epoxy polymer. Based on the selective adsorption hypothesis and the molecular diffusion, it is speculated that the hardener molecules were unevenly distributed in the nanocomposites, which caused imbalanced stoichiometry between the epoxy and the hardener and finally decreased the T g. Some results that may support the adsorption hypothesis were given and discussed.

Original languageEnglish
Pages (from-to)6891-6895
Number of pages5
JournalJournal of Materials Science
Volume47
Issue number19
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering

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