Electrochemically obtained insulating and conducting polymers and composites of acrylonitrile

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Tezin Türü: Doktora

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Kimya Bölümü, Türkiye

Tezin Onay Tarihi: 1996

Tezin Dili: İngilizce

Öğrenci: BERRİN YURTTAŞ YILMAZ

Eş Danışman: URAL AKBULUT, LEVENT KAMİL TOPPARE

Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu

Özet:

ABSTRACT ELECTROCHEM1CALLY OBTAINED INSULATING AND CONDUCTING POLYMERS AND COMPOSITES OF ACRYLONITRILE Yılmaz (Yurttaş), Berrin Ph.D ; Department of Chemistry Supervisor: Prof. Dr. Ural Akbulut Co - Supervisor: Prof. Dr. Levent Toppare July 1996, 154pages Acrylonitrile was polymerized by constant potential electrolysis technique. The reduction peak potential of acrylonitrile was determined by cyclic voltammetry and the polymerization potential was based on this reduction peak. The kinetics of polymerization was follovved by gas chromatography analysis. The effect of temperature on conversion, yield and viscosity was determined. Characterization of electrolysis products were made by ÎR analysis. Electrochemically obtained polyacrylonitrile and a commercially available polyacrylonitrile were heat treated to improve their conductivities. The parameters chosen for heat treatment conditions were the temperature, the treatment medium (vacuum ör air) and the doping agent. The conductivities of ali heat treated polymers were measured. The sensitivity and the reproducibility İÜof heat treated polyacrylonitrile samples tovvard water vapor were determined by subseguent exposing and disposing of the polymer to water vapor. The characterization of the heat treated polymers were made by ÎR analysis. The composite films of polyacrylonitrile with polypyyrole and polythiophene were electrochemically prepared at different compositions. The change in conductivity of composites were analyzed as a function of the öne of the insulating component. ÎR, DSC, TGA, SEM analyses were used to characterize the polymer composites. Keyvvords : Conducting Polymers, Composite Polymer, Electrochemical Polymerization, Electroactivity, Electrochromism, VVater Vapor Sensing