Interfacial treatment of multi-layer woven silk/epoxy composites

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Abstract

Surface treatment of the silk fibre by silane coupling agent in order to improve the interfacial strength between silk fibre and epoxy resin has been carried out. Woven silk fibre/epoxy composites have been fabricated to determine the interlaminar fracture toughness of the specimen at different number of fibre plies. The processing technique used to prepare the sample is by a vacuum bagging process and the curing process was carried out in an autoclave. In this study, specimens were fabricated by using silk fibre of between 8 to 14 plies for each panel. First set of composites panel consisted of raw silk fibre while the second sets consisted of silk fibre which has undergone a surface treatment using 3-aminopropyl triethoxysilane coupling agent. Mode I interlaminar fracture test is based on double cantilever beam specimens (DCB) testing method. The results of the GIC were plotted and compared between the two sets. GIC of the composite in set 2 were found to be higher than the value in set 1. During the test, crack propagation is stable and no fibre bridging occurred between both sides of fracture surfaces. All the failure that occurred were at the fibre-matrix interface as seen using SEM. The results shows that fibre surface treatment of silk plies will increases value of GIC. This proved that the GIC of woven silk fibre/epoxy composites can be enhanced by surface treatment using 3-aminopropyl triethoxysilane coupling agent. The results give an improvement of interlaminar fracture toughness between 2.3 - 10.6% at initiation and 5.5 - 9.2% at propagation.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalInternational Review of Mechanical Engineering
Volume4
Issue number1
Publication statusPublished - Jan 2010

Fingerprint

Silk
Fibers
Composite materials
Surface treatment
Coupling agents
Fracture toughness
Autoclaves
Cantilever beams
Silanes
Epoxy resins
Curing
Crack propagation
Vacuum
Scanning electron microscopy

Keywords

  • Adhesion
  • Polymer composites
  • Scanning electron microscopy
  • Surface morphology

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "Interfacial treatment of multi-layer woven silk/epoxy composites",
abstract = "Surface treatment of the silk fibre by silane coupling agent in order to improve the interfacial strength between silk fibre and epoxy resin has been carried out. Woven silk fibre/epoxy composites have been fabricated to determine the interlaminar fracture toughness of the specimen at different number of fibre plies. The processing technique used to prepare the sample is by a vacuum bagging process and the curing process was carried out in an autoclave. In this study, specimens were fabricated by using silk fibre of between 8 to 14 plies for each panel. First set of composites panel consisted of raw silk fibre while the second sets consisted of silk fibre which has undergone a surface treatment using 3-aminopropyl triethoxysilane coupling agent. Mode I interlaminar fracture test is based on double cantilever beam specimens (DCB) testing method. The results of the GIC were plotted and compared between the two sets. GIC of the composite in set 2 were found to be higher than the value in set 1. During the test, crack propagation is stable and no fibre bridging occurred between both sides of fracture surfaces. All the failure that occurred were at the fibre-matrix interface as seen using SEM. The results shows that fibre surface treatment of silk plies will increases value of GIC. This proved that the GIC of woven silk fibre/epoxy composites can be enhanced by surface treatment using 3-aminopropyl triethoxysilane coupling agent. The results give an improvement of interlaminar fracture toughness between 2.3 - 10.6{\%} at initiation and 5.5 - 9.2{\%} at propagation.",
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