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@INPROCEEDINGS{Richter:1055098,
      author       = {Richter, D. and VLASSOPOULOS, D. and HOFFMANN, I. and
                      ALLGAIER, J. and PEPONAKI, K. and KRUTEVA, M. and
                      MONKENBUSCH, M.},
      title        = {{D}ynamics of {P}olymer {R}ings in {R}ing-{L}inear {B}lends
                      combining {R}heology and {N}eutron {S}pin {E}cho
                      {S}pectroscopy},
      reportid     = {FZJ-2026-01855},
      year         = {2026},
      abstract     = {We have investigated the dynamics of polyethylene-oxide
                      (PEO) ring/linear blends of various molecular weight ratios.
                      Both the blend viscosity as well as the microscopic dynamics
                      were studied. The blend viscosity displays a maximum at
                      intermediate ring volume fractions. For symmetric blends the
                      relative viscosity maximum increases with the molecular
                      weight of the polymers, while for asymmetric blends the
                      viscosity maximum gets stronger, if the linear constituent
                      becomes smaller than the ring. Applying neutron spin echo
                      (NSE) spectroscopy on samples containing a fraction of
                      labelled rings, we essentially observed the internal ring
                      dynamics and its modifications as function of ring volume
                      fraction $ϕ_R.$ We observe an increased enslavement of the
                      ring dynamics with higher host Mw. While this holds for all
                      hosts above 10K, linear chains exhibiting only five
                      entanglements are not able to impress its dynamics on the
                      rings. In symmetric ring linear blends increasing ring
                      enslavement well correlates with the increase of the
                      viscosity enhancement observed. For asymmetric blends
                      increasing host Mw in all cases leads to stronger
                      enslavement. The observed increase of the viscosity found
                      for shorter hosts does not find any parallel in the
                      microscopic dynamics. Blends. At $ϕ_R=0.5$ the spectral
                      shapes are still local reptation type, however, the decrease
                      of constraints compared to the neat linear melts is more
                      pronounced for the shorter host. The results qualitatively
                      agree with available simulations validating them.},
      month         = {Mar},
      date          = {2026-03-10},
      organization  = {Synergies in HIgh RESolution
                       Spectroscopy, ILL4, Grenoble (France),
                       10 Mar 2026 - 13 Mar 2026},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / JCNS-1},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1055098},
}