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Infrared spectroscopic studies of thermotropic polyamides

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Summary

Poly (3,3′, 5,5′-tetraethyldiphenylmethane-1, 18-octadecanedi carboxamide) (poly(TEDPM-ODDA)) and poly(diphenylmethane-1, 18-octadecanedicarboxamide) (poly(DPM-ODDA)) are newly synthesized and found mesomorphic phase between 493 and 502 K for the former and no mesomorphic phase for the latter by use of DSC measurements and polarizing microscope observation. In the IR spectra of enantiotropic mesomorphic poly(TEDPM-ODDA), the stepwise high frequency shift of the hydrogen-bonded N-H stretching vibration in crystalline-mesomorphic and mesomorphic-isotropic liquid phase transition suggest formation of the mesomorphic state due to balancing interchain hydrogen bonding and other interchain forces. On the contrary, nonmesomorphic poly(DPM-ODDA) the N-H bands shifts to higher frequency at melting to isotropic liquid at a stretch.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Engineering, Gifu University, Yanagido, 501-11, Gifu, Japan

    Keiichi Moriya, Tohru Minagawa & Shinichi Yano

Authors
  1. Keiichi Moriya
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  2. Tohru Minagawa
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  3. Shinichi Yano
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Moriya, K., Minagawa, T. & Yano, S. Infrared spectroscopic studies of thermotropic polyamides. Polymer Bulletin 33, 209–213 (1994). https://doi.org/10.1007/BF00297357

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  • DOI: https://doi.org/10.1007/BF00297357

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