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@ARTICLE{Metri:848278,
      author       = {Metri, Vishal and Louhichi, Ameur and Yan, Jiajun and
                      Baeza, Guilhem P. and Matyjaszewski, Krzysztof and
                      Vlassopoulos, Dimitris and Briels, Willem},
      title        = {{P}hysical {N}etworks from {M}ultifunctional {T}elechelic
                      {S}tar {P}olymers: {A} {R}heological {S}tudy by
                      {E}xperiments and {S}imulations},
      journal      = {Macromolecules},
      volume       = {51},
      number       = {8},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2018-03539},
      pages        = {2872 - 2886},
      year         = {2018},
      abstract     = {The equilibrium mechanical properties of a cross-linked gel
                      of telechelic star polymers are studied by rheology and
                      Brownian dynamics simulations. The Brownian dynamics model
                      consists of cores to which Rouse arms are attached. Forces
                      between the cores are obtained from a potential of mean
                      force model developed by Likos and co-workers. Both
                      experimentally and in the simulations, networks were created
                      by attaching sticker groups to the ends of the arms of the
                      polymers, which were next allowed to form bonds among them
                      in a one to one fashion. Simulations were sped up by solving
                      the Rouse dynamics exactly. Moreover, the Rouse model was
                      extended to allow for different frictions on different
                      beads. In order to describe the rheology of the
                      non-cross-linked polymers, it had to be assumed that bead
                      frictions increase with increasing bead number along the
                      arms. This friction model could be transferred to describe
                      the rheology of the network without any adjustments other
                      than an overall increase of the frictions due to the
                      formation of bonds. The slowing down at intermediate times
                      of the network rheology compared to that of the
                      non-cross-linked polymers is well described by the model.
                      The percentage of stickers involved in forming inter-star
                      bonds in the system was determined to be $25\%,$ both from
                      simulations and from an application of the Green–Tobolsky
                      relation to the experimental plateau value of the shear
                      relaxation modulus. Simulations with increasing cross-link
                      percentages revealed that on approaching the gel transition
                      the shear relaxation modulus develops an algebraic tail,
                      which gets frozen at a percentage of maximum cross-linking
                      of about $11\%.$},
      cin          = {ICS-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29910512},
      UT           = {WOS:000431088700012},
      doi          = {10.1021/acs.macromol.7b02613},
      url          = {https://juser.fz-juelich.de/record/848278},
}