Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.48: Poster

Mittwoch, 14. März 2018, 18:30–19:45, Poster C

In situ Raman Spectroscopy on Paper Fibres during Tensile Testing and during Hydration — •Alena Bell¹, Sonja Wendenburg², Markus Biesalski², and Robert Stark¹ — ¹TU Darmstadt, Materialwissenschaften, Physics of Surfaces, Alarich-Weiß-Str. 16, 64287 Darmstadt, Germany — ²TU Darmstadt, Chemie, Makromolekulare Chemie, Alarich-Weiß-Str. 8, 64287 Darmstadt, Germany

As cellulose is one of the most abundant materials in the world, it becomes more important to improve its properties, which it shows within paper, such as the wet strength. A promising approach to stabilise the mechanics of cellulose fibres against humidity is the hydrophobisation. Two kinds of cellulose, cotton linters and eucalyptus, were coated with a hydrophobic terpolymer. For the characterisation, two different kinds of measurements were applied, namely hydration and bending experiments without prestress. Both experiments were performed by Raman spectroscopy in situ.

Humidity experiments, which were performed on small strips of paper, show an increase in water band intensity with ongoing hydration and a decrease whithin the drying process for the uncoated samples. This matched the assumption of the superposition of the paper and water Raman spectra. The coated samples do not show a clear trend for the water peak intensity. Bending experiments were performed on small fibre bundles which were extracted by hand from paper sheets and collocated on small tooth combs without prestress. We could show that a band shift of the 1095 cm-1 is observed in fibre bundles.