The International Winter School on Electronic Properties of Polymers Orien­ tation and Dimensionality of Conjugated Systems, held March 9-16, 1991, in Kirchberg, ('lYrol) Austria, was a sequel to three meetings on similar subjects held there. The 1991 winter school was again organized in cooperation with the "Bundesministerium fUr Wissenschaft und Forschung" in Austria, and with the "Bundesministerium fUr Forschung und Technologie" in the Federal Republic of Germany. The basic idea of the meeting was to provide an opportunity for experienced scientists from universities and industry to discuss their most re­ cent results and for students and young scientists to become familiar with the present status of research and applications in the field. Like the previous winter schools on polymers, this one concentrated on the electronic structure and potential~ for application of polymers with conjugated double bonds. This time, however, special attention was paid to the effects of orientation and dimensionality. Anisotropy of the electric conductivity in stretch-oriented samples and whether the transport mechanisms are one-, two-, or three-dimensional or might even have a "fractal dimensionality" were there­ fore central topics. The problem of orientation was extended to systems such as Langmuir-Blodgett films and other layered structures. Accordingly, thin films were the focus of most of the application oriented contributions. Whereas in the previous winter schools discussions on applications dealt with "large volume applications" such as electromagnetic shielding and energy storage, this time "molecular materials for electronics" and prospects of "molecular electronics" were at the center of interest.

Inhalt

I Introduction.- Survey of "Intrinsically Conducting Organic Materials".- II Theory.- The Metallic State of Heavily Doped Trans-Polyacetylene With 1 Figure.- On the Semiconductor-Metal Transition in Conducting Polymers With 1 Figure.- I11-Aligned Polymer Chains.- Competing Electron-Electron/Electron-Phonon Interactions and Polyacetylene.- Electronic Properties of Lattice Solutions for the Continuum Model of Conducting Polymers With 3 Figures.- Polaron and Soliton Lattices Within One-Particle Models of Conducting Polymers with a Degenerate Ground State.- Solitons, Twistons, and Crystallinity on Conducting Polymers With 2 Figures.- Correlation Effects in the Spectra of Soliton Containing Polyenes With 2 Figures.- Interpretation of the Photoinduced Infrared Spectra of Oriented Polyacetylene and Triblock Copolymers With 2 Figures.- Excitons in Chains of Thiophene Rings With 2 Figures.- Electronic Properties of Nonconjugated Polymers: 1,4-Polybutadiene and 1,4-Polyisoprene With 1 Figure.- Optical Transitions and Photoconductivity in Oriented Trans-Polyacetylene With 1 Figure.- Bound States and Non-Monotonic Relaxation Rate in M-X Chains With 5 Figures.- III Transport.- High-? and low-? Polyacetylene: A Comparison With 1 Figure.- A Microscopic Picture for Very High Conductivities in Polymers With 2 Figures.- Percolation in Conducting Polymers - Well and Alive! With 3 Figures.- Implications of the Linear Thermopower of New Polyacetylene With 2 Figures.- The General Temperature Dependence of the Fluctuation-Induced Tunnelling Current. Application to Naarmann-Polyacetylene.- Charge Transport and Its Anisotropy of Pristine and Segmented New (CH)X With 2 Figures.- DC Electrical Anisotropy of Stretchoriented Polyacetylene: Doping and Temperature Dependence With 3 Figures.- Discontinuity and Anisotropy of Conducting Phase in Heterogeneous Systems as Seen by Alternating Current Measurements With 3 Figures.- Small Polarons in Polymeric Tetrathiafulvalenes (PTTF) With 3 Figures.- Microwave Properties of Conductive Polymer Composites With 2 Figures.- In Situ Conductivity Measurements on p-Sexiphenylene and Polyphenylene With 2 Figures.- IV Raman and Optical Spectroscopy.- Raman Characterization of Polarons and Bipolarons in Conducting Polymers With 4 Figures.- The Bond Alternation Linear Chain in Resonance Raman Scattering With 3 Figures.- Correlation of Electronic Properties and Raman Spectra With in a Series of Polymethine Dyes With 2 Figures.- Triplet States in Polydiacetylenes: T-ADMR in Zero Field Between 1.2 and 230 K With 4 Figures.- Femtosecond Optical Absorption in Conjugated Polymers With 5 Figures.- Photoinduced Bipolaron Bands and Vibrational Modes in Poly(isothianaphtene) With 3 Figures.- Fast Processes in Polyphenylene Vinylene: PS-Absorption Studies and Computer Simulation With 2 Figures.- In Situ Spectroscopic Studies on Viologen Functionalized Poly(3-Alkylthiophenes) During Electrochemical Redox Processes With 3 Figures.- V Nonlinear Optics.- Nonlinear Optical Properties of Conjugated Polymers With 4 Figures.- Macromolecular Interactions and Their Influence on the Nonlinear Optical Susceptibility With 4 Figures.- Step Potential Model for Nonlinear Optics Properties of Polyenes With 5 Figures.- Nonlinear Optics with Oriented Conjugated Polymer Thin Films With 4 Figures.- Second Harmonic Generation from Langmuir-Blodgett Films of Donor Acceptor Carotinoids With 4 Figures.- Quantitative Determination of the X(3)-Dispersion of Conjugated Polymers by Resonance CARS Line Shape Analysis With 3 Figures.- Time Resolved CARS Spectroscopy of the Series of Bisdimethylaminomethine Photoisomers With 2 Figures.- Electro-Modulation Spectroscopy of Poly(2,5-Thienylene Vinylene) With 3 Figures.- VI Polyacetylene.- EPR Studies of Segmented Polyacetylene With 5 Figures.- Well Defined Polyacetylene-block-Poly(l,3-cyclopentylene Vinylene) Diblock Copolymers, Synthesis and Characterization With 7 Figures.- Optical and Electronic Properties of a Highly Disordered Form of Polyacetylene - Distinguishing Between Localized Defects and Conformational Disorder With 3 Figures.- Optical Properties and Conjugation-Length-Effects of Polyacetylenes and Copolymers With 4 Figures.- Electron Energy-Loss Spectroscopy on Doped and Undoped ?-Carotene With 4 Figures.- VII Polyaniline.- Properties of Solution Cast Films of Polyaniline and the Effects of Orientation With 4 Figures.- Transport Dimensionality in Conducting Polymers: The Case of Polyaniline With 4 Figures.- Low Temperature Transitions in Polyanilines With 2 Figures.- Vibrational Analysis of the Reduced Form of Polyaniline With 3 Figures.- In Situ FTIR-ATR-Spectroscopy of Polyaniline in Aqueous Solutions With 3 Figures.- Ellipsometric Analysis of the Conversion Processes in Thin Polyaniline Films With 4 Figures.- Slow Relaxation in Conducting Polymers With 2 Figures.- VIII Polyphenylenevinylene, Polypyrrole.- Control of Electronic, and Physical Structure Through Modification of the Synthesis and Processing in Precursor-Route Poly(arylene vinylene) Polymers With 3 Figures.- Studies of the Vibrational Properties of Poly(arylene vinylenes) With 1 Figure.- Electro-Optic Properties of Precursor Route Poly(arylene vinylene) Polymers With 3 Figures.- Polyparaphenylene Vinylene: SSH-Hamiltonian Description of the Electronic and Vibrational Properties With 3 Figures.- Mössbauer, EPR and Susceptibility Studies of Polypyrrole Doped with FeCl3 With 3 Figures.- Differential Pulse Polarography - A Versatile Tool in the Redox Chemistry of Conjugated Polymers With 5 Figures.- IX Polythiophene.- Anisotropy of Structure and Transportin Oriented Poly(3-alkylthiophene) With 4 Figures.- Determination of the Optical Constants of a Polythiophene Thin Film With 4 Figures.- Electrochemical Synthesis of Poly(dithieno thiophene) With 4 Figures.- NMR Studies of Poly(3-alkylthiophenes) With 3 Figures.- Modelling the Al/Polythiophene Interface: A Semiempirical Quantum Chemical Approach With 3 Figures.- Impedance Studies of Poly(4,4'-dialkyl-2,2'-bithiophenes) With 3 Figures.- Influence of Polymerization Irregularities on the Electronic Properties of Polythiophene With 2 Figures.- Luminescence Quenching in Poly(3-hexylthiophene) by Charge Injecti…