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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Ionic Liquids

CPP 3.3: Vortrag

Montag, 31. März 2014, 10:00–10:15, ZEU 260

Effect of ionic liquid on the surface energy of carbon black and reinforcement of high performance elastomers — •Frank Fleck, Patrick Stratmann, and Manfred Klüppel — Deutsches Institut für Kautschuktechnologie e.V., Eupener Straße 33, 30519 Hannover

In the present work the polymer-filler interaction of reinforced elastomers is investigated with different experimental methods. To understand how the surface influences the properties of the system, carbon black was modified with the ionic liquid 1-allyl-3-methylimidazolium chloride (AMIC).

To quantitatively describe the modification of the surface activity, the surface of the filler was characterized by static gas adsorption measurements. To get information about the interaction strength of the monomers of typical diene rubbers, 1-butene was used as adsorbate. With that the energy distribution function is calculated from the adsorption isotherms. It is found that the ionic liquid molecules tend to interact with the high energetic sites of the carbon black and therefore the adsorption strength of polymer chains at the filler surface is reduced in the case of nonpolar rubbers. By using more polar elastomers the cations of the ionic liquid can interact with the polar groups of the polymer chain, which influences the polymer-filler interaction in a different way than for nonpolar systems.

Based on flocculation experiments it can be shown, that the mechanism of forming a filler network is strongly influenced by the modification with ionic liquids.