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Optical properties of a polydiacetylene crystal: poly-[1,6-di(N-carbazolyl)-2,4-hexadiyne]

✍ Scribed by R.J. Hood; H. Müller; C.J. Eckhardt; R.R. Chance; K.C. Yee

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
433 KB
Volume
54
Category
Article
ISSN
0009-2614

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✦ Synopsis

Normal mcidcnce rdl~ct~on spectra and Krxners-Kromg traniforms arc reportcd for ZI polydracctylcne cryctal, IKlID (substituent poup: N-carb;lzolyltnetliyl) '1 hc lowcit energy optic.d transition for tlte polymcr backbonc IS found at 15300 cïll-l. the loaest valuc obtdined tbus far for a polydiacetylcnc. Ilx polymer cham 'md tbc carb.zolyl wbstltuent poup may ix: trcsted ris isolated chromophorcs --the fermer domm_tt&g thc w\ible portion of thc spcctr.r .md the lattcr dominating the UV portion Polnrization studies for the (001) and (101) fawr of IX'IID perrntt unambiguous .rwgnmcr.t of tite two lowest eurr&y transitions in thc carb~ïwlyl ~roup at 28 750 cm-' and 33 2.50 cm-' as rhort-and lonp-axis polxizcd, respectively.

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Abstraet--A series of thermotropic poly(2-n-alkyl-l,4-phenylene terephthalates) was synthesized and characterized for liquid crystalline properties by differential scanning calorimetry (DSC) and by use of a polarizing microscope. All members of the series, from the polymer with the n-hexyl to that w