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Synthesis and properties of polyetherurethane pendant with azo-dye by N-substitution

✍ Scribed by Xudong Jia; Xuehai Yu

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
413 KB
Volume
62
Category
Article
ISSN
0021-8995

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✦ Synopsis

Polyurethane elastomers pendant with azo-dye were prepared by N-substitution by a twostep process. First, the polymer is metalated by sodium hydride, and then the prepared urethane polyanion is treated with w-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.

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