Optical and thermal properties of diethyl-(2R, 3R) (+)-tartrate based chiral polyurethanes with main chain amido chromophores

Authors

  • Elizabeth Chirackal Varkey,

    1. Department of Applied Chemistry, Cochin University of Science and Technology, Cochin-22, Kerala, India
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  • Krishnapillai Sreekumar

    Corresponding author
    1. Department of Applied Chemistry, Cochin University of Science and Technology, Cochin-22, Kerala, India
    • Department of Applied Chemistry, Cochin University of Science and Technology, Cochin-22, Kerala, India
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Abstract

The toluene diisocyanate based optically active chiral polyurethanes were synthesized according to the symmetry conditions. The noncentrosymmetric (both charge asymmetry and spatial asymmetry) environment were attained by the incorporation of the chiral units (diethyl-(2R,3R)(+)-tartrate) and donor-acceptor building blocks in the main chain which induce a helical conformation in the macromolecular chain. A series of optically active polyurethanes containing chiral linkages in the polymer back bone have been synthesized by using DBTDL catalyst by incorporating the amido diols which were obtained by the aminolysis of ε-caprolactone by using the diamines, diaminoethane, diaminobutane, and diaminohexane respectively. The effect of incorporation of the chiral molecule diethyl-(2R,3R)(+)-tartrate on the properties of polyurethanes was studied by changing the chromophores and also by varying the chiral-chromophore composition. Various properties of polyurethanes were investigated by UV, Fluorescence, TG/DTA, XRD, polarimetric techniques, Kurtz-Perry powder techniques, etc. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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