[diss] Perustieteiden korkeakoulu / SCI

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Browsing [diss] Perustieteiden korkeakoulu / SCI by Degree programme/Major subject "Engineering physics/ Polymer physics"

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  • Investigations of functional electroactive polymers
    (2006-06-08) Tiitu, Mari
     Doctoral dissertation (article-based)
    Conjugated polymers containing pi-conjugated backbones form a scientifically and technologically important class of polymers. In their undoped form they are semiconductors, but they can be doped for electrical conductivity, and allow redox-activity, which all can lead to functional materials. One of the most important conjugated polymers in large scale applications is polyaniline due to its economics and good stability. Polyaniline is used for applications requiring conductivity as well as corrosion inhibition. In this thesis, conducting network structures based on acid doped polyaniline are prepared within solvent and polymer matrices, in order to investigate percolation phenomena. Self-assembled structures have been investigated to study confinement of the polyaniline chain in nanosized domains and its effects on conductivity. A concept was identified and patented to achieve a novel anticorrosion coating based on polyaniline/epoxy compositions. In some applications ionic or protonic conductivity is preferred instead of electronic conductivity. These include e.g. fuel cell membranes or applications where colorless conductive materials are needed. The thesis describes a model material for fuel cell membranes, where the mechanical and conductivity properties can be separately tailored due to self-assembly, as well as a novel material to allow colorless antistatic paper coatings.