Dramatic reductions in water uptake observed in novel POSS nanocomposites based on anhydride-cured epoxy matrix resins

Ian Hamerton*, Winnie Tang, Jose V. Anguita, S. Ravi P Silva

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
273 Downloads (Pure)

Abstract

A methylnadic anhydride-cured diglycidylether of bisphenol A, is prepared and characterised and a mono-epoxy POSS reagent added (0.5–4 wt-%) to produce a series of nanocomposites. Two reaction mechanisms are observed involving esterification at lower temperatures (60–180 °C) and etherification at temperatures above 180 °C. Using the Ozawa and Kissinger methods, the activation energy for the first reaction was found to be 87–90 kJ/mol and 122–124 kJ/mol for the second reaction. Incorporation of POSS into the epoxy-anhydride network increases the Tg and cross-link density, indicating a more rigid network, but the values do not follow a trend based solely on POSS content. The char yield increases with POSS content with very little change in the degradation temperature. Incorporation of POSS (1 wt-%) can reduce the moisture uptake in the cured resin by ∼25% at 75% relative humidity. This is accompanied by a lower impact on glass transition temperature: the Tg is reduced by 10 K at saturation, compared with 31 K for the unmodified epoxy.

Original languageEnglish
Pages (from-to)186-198
Number of pages13
JournalMaterials Today Communications
Volume4
Early online date10 Aug 2015
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • Epoxy resins
  • Nanocomposites
  • POSS
  • Water uptake

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