Dynamics of polymers in elongational flow studied by the neutron spin-echo technique

作者：Rheinstadter Maikel C^*; Sattler Rainer; Haeussler Wolfgang; Wagner Christian

来源：Physica B: Condensed Matter , 2010, 405(17): 3690-3693.

DOI：10.1016/j.physb.2010.05.067

• Polymer dynamics
• Elongational flow
• Neutron scattering
• Neutron spin-echo

The nanoscale fluctuation dynamics of semidilute high molecular weight polymer solutions of polyethylenoxide (PEO) in D(2)O under non-equilibrium flow conditions were studied by the neutron spin-echo technique. The sample cell was in contraction flow geometry and provided a pressure driven flow with a high elongational component that stretched the polymers most efficiently. Neutron scattering experiments in dilute polymer solutions are challenging because of the low polymer concentration and corresponding small quasi-elastic signals. A relaxation process with relaxation times of about 10 ps was observed, which shows anisotropic dynamics with applied flow.

• 出版日期2010-9-1