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Comparing investigation of the smectic C and A phases of the di-n-alkyl 4,4′-azoxycinnamates (II) X-ray studies

✍ Scribed by Dr. S. Diele; Dr. P. Schiller; A. Wiegeleben; Prof. Dr. D. Demus


Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
392 KB
Volume
24
Category
Article
ISSN
0232-1300

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✦ Synopsis


The paper continues tho investigation of the srnectic C and A phases of the title compounds which lias been done in Part I by DSC calorirnetry. Here the layer spacings in the Sc and S, phases are presented which exhibit a remarkable different temperature dependence in the S( phases within the homologous series. A tendency of a change from a second order S,-/X, transition t o a first order transition has becn found. The layer spacings of the SA phase show a cliain Icngth dependent difference t o tho lengths oE the molecules which may be explained by an increasing airiount of gauchc confortriatioris in the Jiigher liornologues.

I n dieser Arbeit werden weitcre Untersiichurigen tler srriektisclicn Cund A-Phasen der Titelverhintlungen, die 11ii Teil I rnit DSC-Kalorirnetrie untersucht worden wsreri, beschrieben. Die Scliielitdickeri der Cund A-Phasen wurtlen grrriessen, diejenigen der C-Pliaseri zeigrn innrrhalb der hornologrn Reihe erliebliche Unterschlecle in ilirer Temperaturabliangigkcit. Die C/A-Umwantllung zeigt cine Tentlenz, von der zweitcn Ortlnung z u r ersteri Ortlnnng iibcrzugelien. Die Schichtdicken tlpr A-Phasen zeigen eine krttenlfingenabliangigc Differenz zu d r n MolekdllBngen, was init dern zunrlmirndcn Antril a n gauche-ECoriforrnercn bei den holicren Horuologrn begrdndct werclen kann.


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