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Preparation, thermo‐optic property and transmission loss of chiral azobenzene polyurethane
Author(s) -
Liu Jinhua,
Qiu Fengxian,
Cao Guorong,
Shen Qiang,
Cao Zhijuan,
Yang Dongya
Publication year - 2011
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.33980
Subject(s) - materials science , thermogravimetric analysis , differential scanning calorimetry , glass transition , polyurethane , azobenzene , thermal stability , polymer chemistry , analytical chemistry (journal) , polymer , chemistry , organic chemistry , composite material , physics , thermodynamics
A novel chiral azobenzene polyurethane (CAPU) was prepared from chromophore, chiral reagent L (−)‐tartaric acid and toluene diisocyanate (TDI). The chemical structure and the thermal property were characterized by UV‐Vis spectrum, FT‐IR, 1 H NMR, circular dichroism (CD) spectrum, differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). DSC and TGA experiments showed that the glass transition temperature ( T g ) and the decomposition temperature ( T d ) at 5% mass loss were 110°C and 199°C, respectively. The refractive index ( n ) and thermo‐optic coefficient (d n /d T ) of the CAPU were measured at 650 nm wavelength and different temperature by attenuated total reflection (ATR) technique. By using CCD digital imaging devices, transmission loss of CAPU was measured and the value is 0.565dB/cm. The results will provide the foundation for many potential applications such as digital thermo‐optic switch materials and other fields in the future. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011