Drawdown prepreg coating method using epoxy terminated butadiene nitrile rubber to improve fracture toughness of glass epoxy composites

P S Shivakumar Gouda, John D Williams, Mehdi Yasaee, Vijay Chaterjee, Dayananda Jawali, Sameer Rahatekar, Michael R Wisnom

Research output: Contribution to journalArticle (Academic Journal)

12 Citations (Scopus)
345 Downloads (Pure)

Abstract

Laminates of fibre-reinforced prepreg have excellent in-plane mechanical properties, but have inadequate performance in the through thickness direction. Here, we address this issue by application of epoxy-terminated butadiene nitrile (ETBN) liquid rubber between the prepreg laminae using an automatic draw bar coating technique. Test results reveal that by adding ETBN in small quantities in the range of 9.33–61.33 g/m2, the interlaminar critical energy release rates (GIc and GIIc) are improved by up to 122% in mode-I and 49% in mode-II. Moreover, this finding is further supported by the dynamic mechanical analysis thermograms that clearly indicate that coating has not altered the Tg of ETBN-coated samples. Scanning electron microscopic analysis of fracture surfaces showed that rubber particles formed micro cavitations in the epoxy, causing localised rubber rich regions. These resin-rich regions require more energy to fracture, resulting in increased toughness of the glass epoxy prepreg systems.
Original languageEnglish
Pages (from-to)873-884
Number of pages12
JournalJournal of Composite Materials
Volume50
Issue number7
Early online date4 May 2015
DOIs
Publication statusPublished - 23 Jan 2016

Keywords

  • Polymer–matrix composites
  • particle-reinforcement
  • fracture toughness
  • prepreg coating

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