Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: POSTERS Polymer Physics

CPP 13.16: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Structure-property relationship in minor ampullate spider silk as studied by combined mechanical and time-resolved polarized FTIR spectroscopy — •Roxana-Giorgiana Ene, Periklis Papadopoulos, and Friedrich Kremer — Institut für Experimentelle Physik I, Leipzig, Germany

Simultaneous FTIR and mechanical measurements are employed in order to explore the relation between macroscopic and microscopic properties, in spider silk[1].Minor ampullate has been studied because although its chemical structure is similar with major ampullate,their mechanical properties differ considerably[2].The way the different nanocrystalline building blocks are interconnected is investigated by stretching the sample. Mechanical studies on minor ampullate silk show that the stiff crystalline domains are connected in series with the amorphous chains and that the mechanical field inside the fiber is uniform[3]. The results reveal oriented crystals interconnected by prestrained chains. It is shown that minor ampullate can be described by the same model[2] as for major. The prestress is significantly lower, explaining the lower modulus, while the toughness is similar. References: [1]P.Papadopoulos, J.Sölter, F.Kremer;Eur.Phys.J.E:Soft Matter 24,193(2007) [2]P.Papadopoulos, J.Sölter, F.Kremer;in press Colloid Polym.Sci(2008) [3]P.Papadopoulos, R.G.Ene, I.Weidner, F.Kremer (in preparation)