Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Polymer Dynamics II

CPP 58.2: Vortrag

Freitag, 4. April 2014, 10:00–10:15, ZEU 114

Network structure and entanglement effects in saturated and unsaturated acrylonitrile elastomers — •Patrick Stratmann^{1, 2}, Frank Fleck^{1, 2}, and Manfred Klüppel^{1, 2} — ¹Deutsches Institut für Kautschuktechnologie e.V. — ²Eupener Straße 33, 30519 Hannover

Differently cross-linked, saturated and unsaturated acrylonitrile elastomers (HNBR, NBR) are investigated regarding their entanglement contributions in uniaxial stress strain measurements. Our main focus lies on the assessment of the *non affine* tube model and *slip tube* model in analysing the mechanical data, whereby the influence of entanglement contributions on the fitted topological constraint modulus and crosslink modulus are considered. Conclusions on the validity or invalidity of specific tube theories cannot be drawn without careful consideration of the network microstructure, which determines the entanglement density. Rheological investigations of the viscoelastic response show a difference in the plateau modulus between the nitrile rubber and the hydrogen nitrile rubber due to different entanglement densities. The analysis of the stress strain and rheological data are compared. The *non affine* tube model, which has been extended to consider finite chain extendibility, delivers excellent fits to the measured stress strain data and fair correlations with the estimated entanglement density from the measured plateau modulus.