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Main chain polymers containing banana-shaped mesogens: Synthesis and mesomorphic properties SCIE SCOPUS

Title
Main chain polymers containing banana-shaped mesogens: Synthesis and mesomorphic properties
Authors
Choi, EJAhn, JCChien, LCLec, CKZin, WCKim, DCShin, ST
Date Issued
2004-01-13
Publisher
AMER CHEMICAL SOC
Abstract
Twelve azomethine polymers containing a banana-shaped mesogen as a repeating unit have been synthesized by polycondensation, and their mesomorphic properties were studied. The solution viscosities were measured in a 0.16 g/dL solution in H2SO4 at 30 degreesC, and the values are in the range 0.37-0.79 dL/g. Polymers obtained were characterized by FT/IR and NMR spectrometry, differential scanning calorimetry (DSC), optical microscopy, and X-ray diffractometry (XRD). The effect of spacer length and lateral substituents on the central core as well as the sidearms of these polymers are described. Of the 12 polymers, eight polymers are found to be thermotropic liquid crystals. Among four polymers with a dioxydodecamethylenene spacer, three polymers exhibited banana phases and one polymer revealed a smectic phase; four polymers with a dioxyhexamethylene spacer showed only a nematic phase. The structures of the banana phases in the polymers are also described.
Keywords
FERROELECTRIC LIQUID-CRYSTALS; BENT-CORE MESOGENS; ACHIRAL MOLECULES; SMECTIC PHASE; LATERAL SUBSTITUENTS; FIBERS; HELIX
URI
https://oasis.postech.ac.kr/handle/2014.oak/29754
DOI
10.1021/MA0348122
ISSN
0024-9297
Article Type
Article
Citation
MACROMOLECULES, vol. 37, no. 1, page. 71 - 78, 2004-01-13
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