Premium
Steam and heat setting of nylon 6 fiber. VII. Infrared spectra of nylon 6 prepared from N‐deuterated ε‐caprolactam and the water accessibility of nylon 6 in steam setting
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.1965.070090108
Subject(s) - caprolactam , nylon 6 , deuterium , polymer , infrared spectroscopy , infrared , polymer chemistry , hydrogen bond , materials science , recrystallization (geology) , intermolecular force , polymerization , monomer , chemistry , molecule , organic chemistry , paleontology , biology , physics , quantum mechanics , optics
The infrared spectrum of deuterated ε‐caprolactam was examined. It was confirmed spectroscopically that the hydrogen of the NH group in ε‐caprolactam is exchanged for deuterium after repeated exchange reactions. The deuterated ε‐caprolactam was polymerized, and the infrared spectrum of the polymer (called as ND polymer) is compared with that of the normal nylon 6 polymer (called NH polymer) which was steam‐set in D 2 O vapor at 135°C. Characteristic absorption bands of ND polymer are observed at 967, 896, 888, 876, and 719 cm. −1 . The water accessibility of both NH and ND polymer was estimated from the spectra of both samples subjected to the repeated steam setting in D 2 O and H 2 O alternately at 130°C. The results show that at the initial stage of the repeated steam setting, H 2 O and D 2 O molecules may penetrate into the ordered regions in the polymers and partially break down intermolecular hydrogen bonds; such phenomenon may be followed by an exchange reaction and recrystallization. Subsequent stages of steam setting, however, no longer bring about such an effect.