We have studied the relationship between electrical conductivity or photoconductivity and structure of nylon 6 drawn. Structural change by the cold uniaxial stretching was examined by the polarized infrared absorption spectra.
As the drawn ratio grows larger, the degree of orientation from the dichroic value increased. Especially, the dichroic value of the amide band increased steeply at first, while other bands saturated slowly with increasing stretching. The amorphous parts are converted into the crystal parts by stretching. The stretching are attributed to morphological changes in nylon. The ratio of absorption density of 935 cm
-1 to 1, 125 cm
-1 increased with drawn ratio.
The conductivity and photoconductivity decreased with drawn ratio. The anisotropy of conductivity and photoconductivity of nylon 6 were observed. The photoconductivity in the stretching direction (perpendicular cell) is larger than that in the transverse direction (parallel cell). The conductivity appears to be extremely sensitive to polymer crystallinity and morphology. The anisotropy of conductivity is considered to be caused by the change of the aggregation in amophous parts which plays an important role for the ionic conduction.
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