Modern Polymer Spect..

148 3 ViLwntional Spectra us N Probe of Striictural Order
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575-565
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52 6-50 5
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Figure 3-26. (continued)
dependent Raman and infrared spectra [I 141 it could be concluded that, in the K
phase, most of the decamethylene segments are in the trans-planar conformation
and that upon heating gnuclze rotamers are generated. The identification of what
kind of conformational defects occur in the disordering process when the temperature
increases can only be attempted by the study of the temperature-dependent
spectrum in the traditional CH2 wagging range. We restrict here our analysis to
the temperature-dependent spectra in the usual defect modes range from - 1400 to
- 1300 cm-'. We aim at revealing the conformational evolution through phase
transition of the segments consisting of 10 CH-, groups. Figure 3-27 illustrates the
temperature-dependent infrared spectrum in the CH2 wagging range plotted in