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- W2016072259 abstract "The paper continues the investigation of the smectic C and A phases of the title compounds which has been done in Part I by DSC calorimetry. Here the layer spacings in the SC and SA phases are presented which exhibit a remarkable different temperature dependence in the SC phases within the homologous series. A tendency of a change from a second order SC/SA transition to a first order transition has been found. The layer spacings of the SA phase show a chain length dependent difference to the lengths of the molecules which may be explained by an increasing amount of gauche conformations in the higher homologues. In dieser Arbeit werden weitere Untersuchungen der smektischen C- und A-Phasen der Titelverbindungen, die im Teil I mit DSC-Kalorimetrie untersucht worden waren, beschrieben. Die Schichtdicken der C- und A-Phasen wurden gemessen, diejenigen der C-Phasen zeigen innerhalb der homologen Reihe erhebliche Unterschiede in ihrer Temperaturabhängigkeit. Die C/A-Umwandlung zeigt eine Tendenz, von der zweiten Ordnung zur ersten Ordnung überzugehen. Die Schichtdicken der A-Phasen zeigen eine kettenlängenabhängige Differenz zu den Moleküllängen, was mit dem zunehmenden Anteil an gauche-Konformeren bei den höheren Homologen begründet werden kann." @default.
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- W2016072259 date "1989-10-01" @default.
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- W2016072259 title "Comparing investigation of the smectic C and A phases of the di-n-alkyl 4,4′-azoxycinnamates (II) X-ray studies" @default.
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- W2016072259 doi "https://doi.org/10.1002/crat.2170241017" @default.
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