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@ARTICLE{Zinn:825204,
      author       = {Zinn, Thomas and Willner, Lutz and Lund, Reidar},
      title        = {{T}elechelic {P}olymer {H}ydrogels: {R}elation between the
                      {M}icroscopic {D}ynamics and {M}acroscopic {V}iscoelastic
                      {R}esponse},
      journal      = {ACS Macro Letters},
      volume       = {5},
      number       = {12},
      issn         = {2161-1653},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2016-07675},
      pages        = {1353 - 1356},
      year         = {2016},
      abstract     = {Telechelic polymers, that is, hydrophilic polymers with
                      hydrophobic end-groups, spontaneously form hydrogels
                      consisting of interconnected micelles. Here we investigate
                      the relation between the microscopic dynamics determining
                      the connectivity, that is, the lifetime of the physical
                      bonds and the resulting rheological properties. This is
                      achieved by quantitatively relating the chain exchange
                      kinetics measured by time-resolved small-angle neutron
                      scattering (TR-SANS) and the mechanical response obtained
                      from linear oscillatory shear measurements. The results show
                      that the characteristic relaxation time obtained from
                      rheology coincides exactly with TR-SANS at intermediate
                      concentrations. The activation energy, Ea, is
                      concentration-independent and remain exactly the same as for
                      TR-SANS. Upon crossing the melting point, a discrete change
                      in activation energy is observed showing the contribution
                      from the enthalpy of fusion to the release/debridging
                      process. The results clearly show that the mechanical
                      response and connectivity indeed are controlled by molecular
                      exchange processes. The relaxation time at the lowest
                      concentration is found to be faster in rheology as compared
                      to TR-SANS, which can be quantitatively attributed to
                      entropic forces arising from conformational deformation of
                      bridging chains.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000390621100011},
      doi          = {10.1021/acsmacrolett.6b00824},
      url          = {https://juser.fz-juelich.de/record/825204},
}