Journal
SYNTHETIC METALS
Volume 157, Issue 22-23, Pages 988-996Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2007.10.002
Keywords
polyaniline; emeraldine base; aggregation; ionic liquid; GPC; UV-vis spectroscopy; LiCl; hydrogen bond; molecular weight determination
Ask authors/readers for more resources
Strong aggregation between chains of polyaniline (PANI) emeraldine base (EB) molecules dissolved/dispersed in N-methyl-2-pyrrolidinone (NMP) results in a multi-modal molecular weight distribution in gel permeation chromatograph (GPC) results, regardless of how low the concentration of EB is. The addition of a salt, such as lithium chloride (LiCl), is known to improve EB solubility in NMP by deaggregating the polymer chains. However, we have found that ionic liquids, such as 1-methyl-3-butyl imidazolium teirafluoroborate ([BMIM][BF4]) or 1-methyl-3-ethyl imidazolium tetrafluoroborate ([EMIM][BF4]), not only have less impact on the EB chain conformation than LiCl does, but also deaggregate the EB molecules more effectively. A mono-distributed GPC peak is obtained for EB (M-w up to 3 x 10(5) g/mol) dissolved in the NMP/ionic liquid solutions. Therefore, the EB molecular weight distribution is characterized more accurately by using the NMP/ionic liquid solution than the NMP/LiCl solution. Published by Elsevier B.V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available