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Analysis of the effects of fibre surface modification of aramid fibres in a thermoplastic matrix

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  • Chemistry


Fundamental Characterization of PP Extrusion ANALYSIS OF THE EFFECTS OF FIBRE SURFACE MODIFICATION OF ARAMID FIBRES IN A THERMOPLASTIC MATRIX Austin B. Coffey, Waterford Institute of Technology, Ireland Abstract Aramid fibers were subjected to a variety of surface treatments to improve the interfacial stress transfer between a thermoplastic matrix and the treated fiber composite. Analytical techniques to characterize the effect of surface treatment included DSC, Optical Microscopy, AFM and micromechanical analysis using Raman spectroscopy. Correlations between the different analysis methods were identified. It was found that plasma modified and chloride grafted fibers had the largest degrees of transcrystallinity, highest nucleation rates and greatest interfacial shear strength between fiber and matrix. Introduction It is well known that the mechanical properties of fiber-reinforced composites are highly dependent on the interactions between the fiber and the matrix. The primary role of the interface in composites is to transfer the load from the matrix to the fibers. To take full advantage of the mechanical properties of the fiber and matrix, the interfacial shear strength between the fiber and matrix must be greater than the failure shear strength of the matrix or of the fiber. Several mechanisms that contribute to adhesion have been identified, namely, mechanical, physical interaction, and chemical bonding at the fiber–matrix interface. Due to the poor adhesion between aramid fibers and most matrices, aramid fiber-reinforced composites are characterized by relatively low off-axis properties [1]. This limitation is further aggravated by the skin–core morphology and the weaker skin properties of aramid fibers. In fact, it was observed that aramid–epoxy interfacial failure involves failure by fibrillation at the fiber outer surface, which suggests the presence of a cohesive weak layer on the fiber exterior that can fail at low shear levels,

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