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Steam and heat setting of nylon 6 fiber. IX. Changes in infrared spectra with deuteration of heat‐set nylon 6
Author(s) -
Koshimo A.
Publication year - 1965
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1965.070090110
Subject(s) - crystallinity , nylon 6 , amorphous solid , deuterium , infrared , materials science , heat capacity , nylon 66 , infrared spectroscopy , analytical chemistry (journal) , intensity (physics) , degree (music) , diffusion , spectral line , thermodynamics , polymer chemistry , composite material , chemistry , polymer , optics , organic chemistry , atomic physics , physics , polyamide , acoustics , astronomy
The 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 D 2 O 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} where I 0 and I are the intensity of the incident and the transmitted light respectively, l the thickness, and α the degree of crystallinity. Here K ′ C represents the number of free NH groups in the amorphous fraction. The value K ′ C is increased by steam setting and decreased by dry heat setting.