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Synthesis and properties of polyetherurethane pendant with azo‐dye by N‐substitution
Author(s) -
Jia Xudong,
Yu Xuehai
Publication year - 1996
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/(sici)1097-4628(19961219)62:12<1979::aid-app1>3.0.co;2-f
Subject(s) - polyurethane , azobenzene , polymer chemistry , photoisomerization , fourier transform infrared spectroscopy , chemistry , hydrogen bond , azo compound , polymer , materials science , photochemistry , molecule , isomerization , organic chemistry , chemical engineering , engineering , catalysis
Polyurethane elastomers pendant with azo‐dye were prepared by N‐substitution by a two‐step process. First, the polymer is metalated by sodium hydride, and then the prepared urethane polyanion is treated with ω‐bromohexyloxyphenyl‐ p ‐nitroazobenzene. The polyurethanes were characterized by NMR, UV, FTIR, GPC, DMA, X‐ray, and polarized optical microscopy. The reaction caused cleavage of some allophanate bond degradation and narrower MW distribution. As the substitution degree increased, the hydrogen bonds in polyurethane diminished and phase mixing with azo‐dye was enhanced. Photoisomerization of the pendant azo‐dye was also observed. © 1996 John Wiley & Sons, Inc.