Study on Raman spectra of aliphatic polyamide fibers

Abstract Raman spectrometry was employed to study the characteristics of Raman spectra of aliphatic polyamide fibers, which were treated with sodium hydroxide, sulfuric acid and copper sulfate, respectively. Raman spectra under different conditions were obtained and the characteristics of the Raman spectra were analyzed. The influences of sodium hydroxide, sulfuric acid and copper sulfate on the lifetime of vibrational modes relating to the main and secondary peaks and relative intensity of the main and secondary peaks were discussed. The results show that Raman peaks beyond 1200 cm −1 appear for aliphatic polyamide fibers processed by sodium hydroxide, while the Raman peaks beyond 1000 cm −1 disappear for aliphatic polyamide fibers processed by sulfuric acid. The variations of the Raman spectra are primarily related to the chemical bonds and molecular structures which can be changed by alkali and acids.