Please use this identifier to cite or link to this item: https://doi.org/10.1021/ma051873m
Title: ATRP synthesis of oligofluorene-based liquid crystalline conjugated block copolymers
Authors: Yu, X.-F.
Lu, S.
Ye, C.
Li, T.
Liu, T.
Liu, S. 
Fan, Q.
Chen, E.-Q.
Huang, W.
Issue Date: 21-Feb-2006
Citation: Yu, X.-F., Lu, S., Ye, C., Li, T., Liu, T., Liu, S., Fan, Q., Chen, E.-Q., Huang, W. (2006-02-21). ATRP synthesis of oligofluorene-based liquid crystalline conjugated block copolymers. Macromolecules 39 (4) : 1364-1375. ScholarBank@NUS Repository. https://doi.org/10.1021/ma051873m
Abstract: A series of well-defined conjugated-liquid crystalline (LC) block copolymers containing oligofluorene and side-chain liquid crystalline polymers with cyanobiphenyl moieties were successfully synthesized by atom transfer radical polymerization. The block copolymers were prepared with number-averaged molecular weights (Mn) ranging from 8000 to 16 000 and narrow molecular weight distribution less than 1.20. The chemical structures of these block copolymers were confirmed by 1H NMR, 13C NMR, and FTIR studies. All of the block copolymers exhibited the smectic mesophase as illustrated by differential scanning calorimetry, polarized optical microscopy, and wide-angle X-ray diffraction. A bilayer structure of mesogens was formed in the smectic layer of block copolymers with a thickness of 3.5 nm. The isotropization of the smectic phase increased with the molecular weight and leveled off at Mn =14 000. The optical properties of these block copolymers in solution and solid-films were investigated comparatively by UV spectroscopy, photoluminescence, and photoluminescent excitation characterization. The results suggest that energy transfer from the LC mesogens to the conjugated oligomer occurs both in dilute solution and in the solid state, which was more efficient in solid state due to higher local chromophore density. © 2006 American Chemical Society.
Source Title: Macromolecules
URI: http://scholarbank.nus.edu.sg/handle/10635/91875
ISSN: 00249297
DOI: 10.1021/ma051873m
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

23
checked on Jul 12, 2018

WEB OF SCIENCETM
Citations

24
checked on Jun 5, 2018

Page view(s)

48
checked on Jun 1, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.