Thermal and optical studies of some di-methyl-di-alkyl ammonium bromides

Waclaw Witko; Malgorzata Godlewska; Patrycja Dynarowicz

doi:10.1117/12.301276

1 January 1998 Thermal and optical studies of some di-methyl-di-alkyl ammonium bromides

Waclaw Witko, Malgorzata Godlewska, Patrycja Dynarowicz

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301276
Event: Liquid Crystals, 1997, Zakopane, Poland

Abstract

Phase situation of homologous series of di-alkyl-di-methyl ammonium bromides represented by the general formula: 2C_nN⁺2C₁Br^-, with n equals 10, 12, 14, 16, 18, was investigated by means of differential scanning calorimetry and optical microscopy methods in the temperature range 20-180 degrees C. A more complex polymorphism as already reported was detected. All the compounds studied show at least tow anomalies on the DSC curves. The high-temperature phase which appears below the isotropic phase has lancet-like dendritic texture which can be attributed to SmB phase. The enthalpy changes at the transitions were calculated.

Citation Download Citation

Waclaw Witko, Malgorzata Godlewska, and Patrycja Dynarowicz "Thermal and optical studies of some di-methyl-di-alkyl ammonium bromides", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301276

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