By using a diamond-anvil pressure cell, the infrared spectra of oxalic acid, polyvinyl alcohol, nylon 6–6, and a number of other materials at various pressures up to 25 000 atm were obtained. Studies on two of the pressure-induced changes, (1) the shift to lower frequencies of the hydrogen-bonded —OH and —NH stretching bands, and (2) the intensity changes of the two —CH2 stretching bands, are reported.
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Reynolds et al. (1964) studied this question.
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