Abstract
The effects of oxygen-plasma treatment of ultra-high-modulus polyethylene (UHMPE) fiber on the transverse properties of the UHMPE fiber/vinylester composites have been investigated. The UHMPE fiber/vinylester unidirectional (UD) laminates were prepared with untreated and oxygen-plasma-treated UHMPE fiber. The oxygen-plasma treatment of the UHMPE fiber increases the transverse tensile strength and failure strain of UHMPE-fiber/vinylester composites and changes the failure initiation site from the interface to the interior of the UHMPE fiber. The oxygen-plasma treatment of the UHMPE fiber introduced micro-pits on the fiber surface; these micro-pits improve the interfacial adhesion in UHMPE fiber/vinylester composites through the mechanical interlocking between the micro-pits and the vinylester resin. Finite-element (FE) modeling was performed to investigate the effect of the micro-pits on stress transfer in the UHMPE-fiber/vinylester composite. The micro-pits are known to increase the stress transfer from the vinylester resin to the UHMPE fiber and this increased stress transfer is correlated with the improved transverse properties and the transition of the failure initiation site after oxygen plasma treatment.
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