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Investigation of the fine structure of high polymers by the method of deuterium exchange. I. Changes in lateral‐order distribution of nylon 6 by heat setting
Author(s) -
Koshimo A.,
Tagawa T.
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.1965.070090112
Subject(s) - amorphous solid , nylon 6 , deuterium , crystallization , polymer , materials science , infrared , infrared spectroscopy , intensity (physics) , analytical chemistry (journal) , thermodynamics , chemistry , crystallography , composite material , optics , organic chemistry , atomic physics , physics
Abstract The lateral‐order distribution of nylon 6 was evaluated by deuteration and infrared spectroscopic measurement. Unset, dry‐heat‐set, and steam‐set samples are placed in contact with D 2 O vapor at various temperatures from 25 to 150°C. After equilibrium of the reaction is attained, they are dried and sealed in a NaCl cell. The ratio of the intensity of ND to CH vibration bands in the 3–4 μ region is calculated from the infrared spectra and plotted against temperature of deuteration. The curves obtained show the accessibility of the sample to D 2 O vapor at various temperatures, and the differential of the curve gives the lateral‐order distributions of nylon 6. The lateral‐order distribution shows that regions of amorphous and of intermediate order decrease, and regions of higher and crystalline increase on dry heat setting, while regions of intermediate order markedly decrease and amorphous and crystalline regions increase on steam setting. These phenomena suggest that loosening of polymer molecules in the amorphous regions and crystallization are caused by the steam setting.