Poly(propyleneimine) Dendrimers Peripherally Modified with Mesogens

Poly(propyleneimine)-based liquid crystalline dendrimers (PPILCDs) with a relatively flexible dendritic scaffold were successfully prepared by the Michael addition reaction of poly(propyleneimine)s with ω-(4‘-cyanobiphenyloxy)alkyl acrylate (1). The structures of PPILCDs were characterized by IR spe...

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Bibliographic Details
Published in:Macromolecules 1999-10, Vol.32 (20), p.6578-6586
Main Authors: Yonetake, Koichiro, Masuko, Toru, Morishita, Takashi, Suzuki, Kazuhiro, Ueda, Mitsuru, Nagahata, Ritsuko
Format: Article
Language:English
Subjects:
Applied sciences
Chemical modifications
Chemical reactions and properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
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Summary:Poly(propyleneimine)-based liquid crystalline dendrimers (PPILCDs) with a relatively flexible dendritic scaffold were successfully prepared by the Michael addition reaction of poly(propyleneimine)s with ω-(4‘-cyanobiphenyloxy)alkyl acrylate (1). The structures of PPILCDs were characterized by IR spectroscopy, 1H NMR spectroscopy, and MALDI−TOF mass spectroscopy. PPILCDs exhibit smectic liquid crystalline natures between −7 and +89 °C. The temperature range of the smectic phases expanded with increases in the generation of the dendritic core and the length of flexible spacers. The homeotropic orientation was allowed to take place in PPILCD with the second-generation scaffold, when it was slowly cooled.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma990107a