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Liquid Crystals Volume 32, 2005 - Issue 5
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Structures and properties of dendrimers having peripheral 2,3‐difluorobiphenyl mesogenic units: effects of dendrimer generation

Osamu Haba Corresponding author Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 3‐4‐16, Jonan, Yonezawa 992‐8510, Japan
,
Ken‐Ichi Okuyama Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 3‐4‐16, Jonan, Yonezawa 992‐8510, Japan
,
Hirotomo Osawa Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 3‐4‐16, Jonan, Yonezawa 992‐8510, Japan
&
Koichiro Yonetake Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 3‐4‐16, Jonan, Yonezawa 992‐8510, Japan
Pages 633-642 | Received 01 Nov 2004, Accepted 09 Jan 2005, Published online: 20 Feb 2007
 
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Abstract

1st–5th generation poly(propyleneimine) dendrimers having peripheral 2,3‐difluorobiphenyl mesogenic groups have been synthesized. They exhibited smectic liquid crystalline behaviour. All the liquid crystalline dendrimers exhibited a smectic A (SmA) phase and a crystal E (E) phase. The SmA–isotropic phase transition temperature increased with increasing generation. In addition, a homeotropic structure was spontaneously formed on a glass plate in the SmA phase for the 2nd, 3rd, and 4th generation dendrimers. The hometropic structure remained unchanged in the phase.

Notes

aEstimated using standard polystyrene calibration.

bNot determined.

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