Previously functional plasma polymers have been demonstrated to act as protective films for reinforcing fibres and provide adhesion to matrix resins in the formation of composite. In this work, the model interphase surface from the allylamine (AAm)1 1,7-octadiene (Oct) plasma copolymer treated with DGEBA-Br epoxy was produced in order to simulate the formation of an interphase region under differing cure regimes. The fundamental interaction of epoxy with a plasma polymer coating deposited onto an electrical grade (E-glass) substrate was investigated to understand the nature of interpenetrating network. X-ray photoelectron spectroscopy (XPS) was utilised to quantify the surface chemistry of the deposited coating and the model interphase surfaces. With a complementary of ARXPS, the penetration of epoxy into the plasma polymer coating was examined. It was found that the ratio of C-N/C increased in all model interphase surfaces in comparison to control AAm plasma copolymer. This confirmed that the chemical reaction between amine functional groups of the plasma polymer and epoxide groups of the epoxy had occurred through the formation of cross-links to form a semi-interpenetrating network (IPN). It therefore resulted in the presence of interphase region in which the AAm plasma copolymer and the epoxy formed the IPN. It was also observed that the interphase was principally formed at the outermost surface. However at a higher post-heat treatment temperature (80°C 2hl 120°C 3hl ISO °c 4h) the chemical bond was found to create through all analysis depth, thus enabling a thicker interphase to be formed. Time of flight secondary ion mass spectrometry (ToF-SIMS) images from the fracture surfaces of model surfaces were used to establish the mode of failure as well as uniformity of the epoxy overlayer. It was demonstrated that the locus of failure occurred at the interface between the AAm plasma copolymer coating and the E-glass substrate. This can confirm a strong interfacial bond between the coating and the epoxy.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:557123 |
| Date | January 2010 |
| Creators | Photjanataree, Penchom |
| Publisher | University of Sheffield |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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