2006
DOI: 10.1103/physrevb.73.094103
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Abstract: The wave-number dependence upon stress and/or strain and temperature of two adjacent optical phonons of aramid fibers has been investigated. The results showed that both phonons soften considerably under axial tension. Experiments at various temperatures under fixed strain conditions have demonstrated that one of the phonons ͑ 1 = 1611 cm −1 ͒ is moderately anharmonic whereas the adjacent phonon ͑ 2 = 1648 cm −1 ͒ exhibits harmonic behavior. By modeling the fibers as one-dimensional molecular wires very good a…

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