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Interfacial mobility and its effect on interlaminar fracture toughness in glass-fibre-reinforced epoxy laminates

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Abstract

The effects of interfacial treatment of glass fibres in glass/epoxy composites were studied through Mode I delamination fracture toughness tests using a double cantilever beam specimen. The treatment of glass fibres with two similar silane coupling agents has been shown to improve the mechanical properties of the composite as a function of the type of coupling agent, γ-aminopropyltriethoxysilane (APS) and γ-aminobutyltriethoxysilane (ABS) have similar chemistry, but differ in mobility (molecular motion) at the coupling agent-epoxy interface. The critical energy release rate, G 1c, for the APS-treated composites (0.59±0.05 kJ m−2) was shown to be higher than that of the ABS-treated one (0.37±0.01 kJ m−2) and also the untreated one (0.31±0.02 kJ m−2). In this case, the bulk structural property appears to be a function of the microscopic interfacial properties including the dynamics of the coupling agent layer. Optical characterization of the fracture surfaces reveal delamination at the epoxy-glass interface for the untreated samples, while the ABS- and APS-treated samples showed less interfacial delamination, respectively.

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  1. Department of Chemistry and Materials Research Center, University of Missouri-Rolla, 65409, Rolla, MO, USA

    T. W. H. Wang & F. D. Blum

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  1. T. W. H. Wang
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  2. F. D. Blum
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Wang, T.W.H., Blum, F.D. Interfacial mobility and its effect on interlaminar fracture toughness in glass-fibre-reinforced epoxy laminates. JOURNAL OF MATERIALS SCIENCE 31, 5231–5238 (1996). https://doi.org/10.1007/BF00355930

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  • DOI: https://doi.org/10.1007/BF00355930

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