Please use this identifier to cite or link to this item: https://doi.org/10.1021/ma035335q
Title: Stimuli-responsive conjugated copolymers having electro-active azulene and bithiophene units in the polymer skeleton: Effect of protonation and p-doping on conducting properties
Authors: Wang, F.
Lai, Y.-H. 
Han, M.-Y.
Issue Date: 4-May-2004
Citation: Wang, F., Lai, Y.-H., Han, M.-Y. (2004-05-04). Stimuli-responsive conjugated copolymers having electro-active azulene and bithiophene units in the polymer skeleton: Effect of protonation and p-doping on conducting properties. Macromolecules 37 (9) : 3222-3230. ScholarBank@NUS Repository. https://doi.org/10.1021/ma035335q
Abstract: A series of stimuli-responsive conjugated copolymers containing alkylated bithiophene and electroactive azulene in the polymer backbone was synthesized by oxidative polymerization. These copolymers were formed in good yields with good solubility in common organic solvents such as chloroform, toluene, and THF. They also possess high molecular weight (M n) ranging from 16 000 to 41 000, and their structures are consistent with those expected as indicated by NMR, FTIR, and elemental analysis. These copolymers are highly thermally and environmentally stable. Like polyanilines, these azulenethiophene copolymers could be rendered highly conductive (1-50 S cm -1) via two routes: iodine doping (p-doping) or protonation by TFA. The effects of p-doping and protonation on their conducting properties could be observed by UV-vis-NIR, EPR, SEM, and CV measurements, revealing different conducting mechanisms in p-doping and protonation. The EPR studies in particular confirmed the reversible protonation-deprotonation processes and high stability of the formed cation radicals at a p-doped or protonated state, indicating their potential application in electronic switcher or antioxidant materials. SEM studies revealed the formation of nanodoping centers upon iodine-doping and formation of conducting channels upon TFA protonation that contributed to the high conductivities observed. CV studies showed a reversible p-doping process, and the electrochemical band gap is in good agreement with their optical band gap. Protonation was found to affect the redox process by greatly decreasing the electrical band gap. Electrochemical impedance spectroscopy (EIS) measurements showed that these polymers became conducting upon protonation with inorganic acids (such as HCl), thus indicating the potential application in corrosion coating.
Source Title: Macromolecules
URI: http://scholarbank.nus.edu.sg/handle/10635/94888
ISSN: 00249297
DOI: 10.1021/ma035335q
Appears in Collections:Staff Publications

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

SCOPUSTM   
Citations

72
checked on Jun 22, 2018

WEB OF SCIENCETM
Citations

73
checked on May 15, 2018

Page view(s)

36
checked on May 11, 2018

Google ScholarTM

Check

Altmetric


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