Carbon Fibers


  • Prof. Wilhelm Ruland

    1. Fachbereich Physikalische Chemie Und Zenturm Für Materialwissenschaft Universität Marburg Hans-Meerwein-Strasse, D-3550 Marburg (FRG)
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    • Wilhelm Ruland studied chemistry at the RWTH Aachen, FRG, and received his Dr. rer. nat. degree in 1957. In the same year, he joined te European Research Associates (ERA) in Brussels, Belgium, as a Senior Staff Scientist. The steps of his career at ERA, were Project Leader (1962), Group Leader (1964) and Managing Director (1967). In 1972, he was nominated to his present position of Professor for Polymer Physics at teh University of Marburg, FRG. He is Fellow of the Institute of Physics, London. At ERA, which was part of the corporate research of the Union Carbide Corporation, he started his studies on the Structure and propeties of carbon fibers which he has continued, with interruptions, until today. Other topics of past and present research are: Molecular structure of coal, crystallinity of polymers, transition from non-graphitic to graphitic carbon, density fluctuations in amorphous and semi-crystalline polymers, SAXS of lamellar two-phase systems, relationship between state of order, molecular orientation and mechanical two-phase systems, relationship between state of order, molecular orientation and mechanical properties of high-modulus polymers fibers, free vibration of viscoelastic materials with high damping, microphase separation in block copolymers, molecular structure and short range order in mesophase pitch, and the relationship between the structure ad mechanical and thermal properties of PAN fibers. His favorite subject is the theory of SAXS and WAXS of non-crystalline and imperfect crystalline structures.


High stiffness and strength combiend with low weight are the advantages offered by carbon fibers in the manufacture of reinforced composites. Effective use of these materials depends on an understanding of structure–property relationships One method of help in this work in small angle X-ray scattering (SAXS), where the intensity distributions (see figure) can be used to determine orientation, shape, size and volume fraction of structural features resulting from different processing temperatures.

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