Electrochemical Synthesis Of Crowned Conducting Polymers: Nature Of Radical Cations In Polymerization And Mechanism Of Conductivity

Description

ABSTRACT

ELECTROCHEMICAL SYNTHESIS OF CROWNED CONDUCTING POLYMERS: NATURE OF RADICAL CATIONS IN POLYMERIZATION AND MECHANISM OF CONDUCTIVITY



Cihaner, Atilla
Ph. D., Department of Chemistry
Supervisor: Prof. Dr. Ahmet M. &Ouml / nal
June 2004, 96 Pages


Poly(dibenzo-18-crown-6) (Poly(DB18C6)) was synthesized by electrochemical oxidation of dibenzo-18-crown-6 (DB18C6) using a mixture of acetonitrile and dichloromethane as solvent and tetrabutylammonium tetrafluoroborate (TBABF4) or tetrabutylammonium hexafluorophosphate (TBAPF6) as supporting electrolyte. The anodic polymerization of DB18C6 was investigated using in-situ ESR and in-situ UV-VIS spectroscopic techniques. Spectroelectrochemical (SPEL) properties and thermal analysis of the resulting polymers have been investigated using UV-VIS, Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA).

Furthermore, new compounds consisting of bis(2-thienyl) methyl (I and II) and bis(2-thienyl) ethyl (III) units linked by polyether bridges have been synthesized and their electrochemical polymerization was performed via constant potential electrolysis (CPE) in an electrolytic solution containing 0.1 M TBAPF6 dissolved in CH3CN. Also, I and II were polymerized via chemical oxidation
which yielded broken &amp / #61552 / -conjugated polymers except for III. The polymers were characterized using 1H-NMR and FT-IR spectroscopic techniques. In addition, copolymers of III with thiophene (Th) and pyrrole (Py) were studied with cyclic voltammetry (CV). SPEL behaviors of the products were investigated using UV-VIS spectroscopic technique.

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1. http://etd.lib.metu.edu.tr/upload/3/12605054/index.pdf

Tags

QD Polymers, Macromolecules 380-388

Additional Fields

Identifer	oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12605054/index.pdf
Date	01 June 2004
Creators	Cihaner, Atilla
Contributors	Onal, Ahmet Muhtar
Publisher	METU
Source Sets	Middle East Technical Univ.
Language	English
Detected Language	English
Type	Ph.D. Thesis
Format	text/pdf
Rights	To liberate the content for public access