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@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},
}