% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Kruteva:904678,
      author       = {Kruteva, Margarita and Allgaier, Jürgen and Monkenbusch,
                      Michael and Hoffmann, Ingo and Richter, Dieter},
      title        = {{S}tructure and dynamics of large ring polymers},
      journal      = {Journal of rheology},
      volume       = {65},
      number       = {4},
      issn         = {0148-6055},
      address      = {Melville, NY [u.a.]},
      publisher    = {Inst.},
      reportid     = {FZJ-2022-00027},
      pages        = {713 - 727},
      year         = {2021},
      abstract     = {A comprehensive study on the molecular conformation and
                      dynamics of very large polyethylene-oxide (PEO) rings in the
                      melt is reported. For all rings, independent of ring size,
                      by SANS we observe a cross over, from a strong Q-dependence
                      at intermediate Q to a $Q^(-2)$ dependence at higher Q.
                      Constructing a generic model including a cross over from
                      Gaussian statistics at short distances to more compact
                      structures at larger distances, we find the cross over at a
                      distance along the ring of $N_(e,0)=45±2.5$ monomers close
                      to the entanglement distance in the linear counterpart. This
                      finding is clear evidence for the predicted elementary loops
                      building the ring conformation. The radius of gyration $R_g$
                      (N) follows quantitatively the result of numerous
                      simulations. However, other than claimed, the cross over to
                      mass fractal statistics does occur around $N≅10N_(e,0),$
                      but up to $N≅4N_(e,0)$ the relation $R_g$ (N) ~ $N^0.39$
                      holds. The self-similar ring dynamics was accessed by
                      PFG-NMR and NSE: We find three dynamic regimes for center of
                      mass diffusion starting (i) with a strongly sub-diffusive
                      domain $〈r_com^2$ (t)〉 ~ $t^α$ (0.4≤α≤0.65) (ii) a
                      second sub-diffusive region $〈r_com^2$ (t)〉 ~ $t^0.75$
                      that (iii) finally crosses over to Fickian diffusion. The
                      internal dynamics at scales below the elementary loop size
                      is well described by ring Rouse motion. At larger scales the
                      dynamics is self-similar and follows very well the
                      predictions of scaling models with preference for the
                      fractal loopy globule (FLG) model.},
      cin          = {JCNS-1 / IBI-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)IBI-8-20200312},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 633 - Life Sciences – Building Blocks of
                      Life: Structure and Function (POF4-633) / 5241 - Molecular
                      Information Processing in Cellular Systems (POF4-524) / 5251
                      - Multilevel Brain Organization and Variability (POF4-525)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-633 /
                      G:(DE-HGF)POF4-5241 / G:(DE-HGF)POF4-5251},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000756000100003},
      doi          = {10.1122/8.0000206},
      url          = {https://juser.fz-juelich.de/record/904678},
}