Abstract
Abstract The morphology and mechanical properties of four different fibers-polyethylene, polypropylene, nylon 66, and polyethylene terephthalate-under the influence of twisting, were investigated. It was found that a model for affine deformation of the fibers can be applied only for very low-twist levels. At high-twist levels the stress distribution and the deformation made in the fiber were very complex. A preferred radial orientation occurred in polyethylene, nylon 66, and polyethylene terephthalate giving rise to an ideal situation for chain tilting and kinking. Polymorphic transition, twinning, and yielding were also observed in the case of polyethylene. The fiber moduli decreased sharply with twist, and this was attributed to the effects of inhomogeneous stress distribution and fibril slippage.
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