Attenuated total reflection (ATR) spectroscopy has been shown to eliminate many of the difficulties encountered in the past with the sample presentation for infrared analysis. Yarn orientation behavior at different draw ratios was studied by analysis of polarized Infrared spectra. The data demonstrate that the α conformation increases with drawing for nylon 6,6 fibers. The chain conformation and crystallite orientation which occur during drawing of nylon 6,6 fibers are also demonstrated. The structural changes observed by the present technique seem to agree well with x-ray diffraction data.

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