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Proceedings Paper

Thermal and optical studies of some di-methyl-di-alkyl ammonium bromides
Author(s): Waclaw Witko; Malgorzata Godlewska; Patrycja Dynarowicz
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Paper Abstract

Phase situation of homologous series of di-alkyl-di-methyl ammonium bromides represented by the general formula: 2CnN+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.

Paper Details

Date Published: 1 January 1998
PDF: 4 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301276
Show Author Affiliations
Waclaw Witko, Institute of Nuclear Physics (Poland)
Malgorzata Godlewska, Jagiellonian Univ. (Poland)
Patrycja Dynarowicz, Jagiellonian Univ. (Poland)


Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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