Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: P6: Biomaterials and Biopolymers
CPP 34.5: Poster
Dienstag, 17. März 2015, 14:00–16:00, Poster C
An x-ray diffraction study of vulcanized fiber and paper exposed to hydrostatic pressure — •Karin Esch1, Dominik Dumke2, Michael Paulus1, Christian Sternemann1, Julia Nase1, Julian Schulze1, Johannes Möller1, Kolja Mende1, Irena Kiesel1, Thomas Büning1, Simon Wulle1, Sergius Janik1, Holger Göring1, Dorothee Wieczorek2, and Metin Tolan1 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany — 2Fakultät Maschinenbau, Technische Universität Dortmund, D-44221 Dortmund, Germany
Vulcanized fiber, consisting of cellulose, is a material of various applications. It is used as an insulator in electrical industry, and can be found in washers/gaskets and welding shields. As vulcanized fiber and paper are made from renewable resources, these materials gained increasing interest in recent years. A way to produce vulcanized fiber is parchmentising. Raw paper is soaked with a ZnCl2 solution, pressed, rested for a certain time, and washed out in steps of descending concentrations. Paper consists mostly of cellulose Iα and Iβ. During the process of parchmentising cellulose I transforms to cellulose II and changes the material’s structure on a molecular level. Consequently, macroscopic properties change, e.g. the material becomes harder and stiffer. The underlying structural changes can be analysed by x-ray diffraction. We studied changes in the diffraction pattern of paper and vulcanized fiber at high hydrostatic pressure up to 4 kbar. An anisotropic reversable compression was found. The experiments were performed at beamline BL9 of the synchrotron lightsource DELTA, Dortmund.