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Thermodynamics and kinetics of morphology formation in pure and blended block copolymers: synthesis, experiment and theory

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This project deals with multicomponent block copolymer materials self-assembling into crystal-like lattices on mesoscopic length scales (this length scale is of great technological interest, for example, in the design of electronic or photonic devices).
While the phase behaviour of binary block copolymers is studied rather well, block copolymers with more than two components are still far away from being thoroughly understood. Surprising morphologies, like helical or knitting-pattern morphologies in block copolymers consisting of three amorphous blocks are spectacular examples. The aim of the project is to investigate the factors controlling the morphology in block copolymers and blends of block copolymers with a range of other materials.
Moreover, besides the phase behaviour also the mechanical properties, especially the deformation mechanisms will be investigated within this project. For this purpose different teams will collaborate on the synthesis of various types of ternary block copolymers (the branched, star-like and linear block copolymers). The morphological and thermodynamic behaviour of these materials (both pure and blended with other ternary block copolymers) as well as blends of some specially synthesised diblock copolymers with other diblock copolymers (AB/BC), homopolymers (AB/C) and random copolymers (AB/R) will be characterised by electron microscopy, X-ray scattering, differential scanning calorimetry, dynamic mechanical analysis and dielectric spectroscopy. These studies will provide a comparable set of data on block copolymers of various topologies and fill gaps of our knowledge about these materials.
Special problems like spinodal decomposition within microphases of such blends will be addressed as well as the influence of salts on the phase behaviour of blends of block copolymers with other polymers, to which end also ultrasonic spectroscopy will be used. These experimental works will be carried out in close touch with theoretical investigations on the phase and scattering behaviour of the various types of block copolymers and their blends, special attention being given to the problem of taking into account the asymmetry interaction effects. Moreover, the interplay of kinetics of the phase formation and thermodynamics will be theoretically investigated to understand the well-known fact that the choice of solvent and casting regime may control the morphology in systems cast from solution. These co-ordinated investigations have the aim to generalise the experimental results in order to obtain predictive tools to guide in future experimental investigations in these systems, which suffer from having a large amount of adjustable parameters.
Results will be presented as scientific papers in refereed journals, as oral and poster contributions to scientific conferences. Patents may be filed where applicable. Some of theoretical results may be presented in form of user-oriented programs supplying experimentalists by a guideline demonstrating immediately what is expected from theoretical point of view for a specified chemical nature and composition.

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UNIVERSITAET BAYREUTH
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Adresse
Universitaetsstr. 30
95440 BAYREUTH
Deutschland

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1999-01852/de

European Union, 2024