The mechanism of reinforcement of polyurethane foam by high-modulus chopped fibres
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- Cotgreave, T.C. & Shortall, J.B. J Mater Sci (1977) 12: 708. doi:10.1007/BF00548161
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The morphology and fracture behaviour of polyurethane foams reinforced by short chopped fibres have been investigated. The presence of the fibres is shown to give rise to localized change in the foam morphology and the extent of this depends upon the fibre bundle size which is affected by the surface treatment. The changes in morphology are correlated with changes in the tensile properties of the foams at ambient and cryogenic temperatures. The systems are shown to be matrix limited with failure occurring remote from the interface which assumes a poassive role during tensile fracture. A critical fibre length for reinforcement of polyurethane foam, which depends on matrix shear strength and foam density, is defined.