Synthesis and Thermal-Optic Properties of Azo Polyurethane Containing Chiral Unit

Feng Xian Qiu; Qing Wang; Cai Hong Chen; Hao Zhao; Jin Hua Liu; Dong Ya Yang

doi:10.4028/www.scientific.net/KEM.538.73

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 538Synthesis and Thermal-Optic Properties of Azo...

Synthesis and Thermal-Optic Properties of Azo Polyurethane Containing Chiral Unit

Abstract:

A new chromophore containing azo group, 3,3'-dichloro-4,4'–di-(4-amino-azo-phenyl) -diphenylmethane (CAAPM), was synthesized based on 3,3'-dichloro-4,4'-diamino– diphenylmethane, sodium nitrite and benzenamine via diazo-coupling reaction. Azobenzene polyurethane (PU) containing chiral unit was obtained from CAAPM, chiral reagent L(-)-tartaric acid and isophorone diisocyanate (IPDI). The chemical structures of CAAPM and PU were characterized by FT-IR and UV-Vis spectroscopy. The measurements of refractive index (n) and thermo-optic coefficient (dn/dT) of polyurethane were demonstrated at complex light. The values of n and dn/dT were used to calculate the dielectric constant (ε) and its variation with temperature (dε/dT). The dn/dT is 4.2000～-3.7000×10^-4°C^-1. The conclusion has a little significance to develop new the digital optical switch (DOS).

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Key Engineering Materials (Volume 538)

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73-76

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https://doi.org/10.4028/www.scientific.net/KEM.538.73

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January 2013

Authors:

Feng Xian Qiu, Qing Wang, Cai Hong Chen, Hao Zhao, Jin Hua Liu, Dong Ya Yang

Keywords:

Azobenzene Polyurethane, Dielectric Constant, Refractive Index

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