期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 102, 期 3, 页码 1079-1086出版社
SPRINGER
DOI: 10.1007/s10973-010-0899-1
关键词
Azomonoethers; DSC; NMR; LPOM; Liquid crystals; Phase transitions; Thermal analyses
Using the Williamson method, a new dye 4-[(4-chlorobenzyl)oxy]-3,4'-dichloroazobenzene (CODA) with liquid crystalline properties was synthesized. The structure and the thermal behavior of CODA were investigated by means of nuclear magnetic resonance, X-ray diffraction, differential scanning calorimetry, and light polarized optical microscopy techniques. The thermophysical processes were monitored by heating-cooling cycles, but the formation of liquid crystal phases were exhibited only for small values of the cooling rates. For the first heating-cooling cycle, the melting and the solidification processes, thus the characteristic temperatures, are shifted to higher values when compared to the following cycles.
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