Dresden 2006 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 9: SYMPOSIUM Disperse Polymer Systems II

CPP 9.4: Talk

Tuesday, March 28, 2006, 15:00–15:15, ZEU 160

Preparation and Viscoelastic Properties of Fibre Networks — •Christian Friedrich, Benjamin Grimminger, and Ciprian Iacob — Freiburg Materials Research Center (FMF), Albert-Ludwigs-Universität, Stefan-Meier-Str. 21, 79104 Freiburg

The dispersion of carbon nanotubes (CNTs) is of crucial importance for the understanding of their mechanical properties as well as for the enhancement of their application potential. Therefore, we dealt with methods enabling the molecular dispersion of CNTs in appropriate matrices. We found that CNTs are best dispersed in ionic liquids such as 1-butyl 3-methyl imidazolium tetrafuoroborate (BMIBF4) together with cosolvents and surfactants. The obtained dispersions were characterized morphologically and rheologically. For the highest concentrations, the rheological response of these compounds resembles that of fibre networks. Using models developed for semiflexible biopolymer networks we can understand the obtained results quantitatively. In contrast to actin-networks, the CNT-networks display rather energetic elasticity than entropic. We discuss the reasons for this peculiarity.