AbstractThe degree of crystallinity of nylon 6 is increased by both steam and dry heat setting, while the diffusion rate of dyes is increased by steam setting and decreased by dry heat setting. These phenomena have been explained in connection with the state of the amorphous regions. This explanation are confirmed from a quantitative analysis of infrared spectra. Heat‐set nylon 6 films were deuterated with D2O at 60°C., for 100 hr. in the vapor phase. Integral intensities of ND stretching vibration band on the spectra are calculated from the equation:documentclass{article}pagestyle{empty}begin{document}$$ {1 mathord{left/ {vphantom {1 {(1 - alpha )l}}} right. kern-nulldelimiterspace} {(1 - alpha )l}}int {log {rm }({{I_0 } mathord{left/ {vphantom {{I_0 } I}} right. kern-nulldelimiterspace} I})dv} = K^prime C $$end{document}whereI0andIare the intensity of the incident and the transmitted light respectively,lthe thickness, and α the degree of crystallinity. HereK′Crepresents the number of free NH groups in the amorphous fraction. The valueK′Cis increased by steam setting and decreased by dry h
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