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@ARTICLE{Dyakonova:186306,
      author       = {Dyakonova, M. A. and Stavrouli, N. and Popescu, M. T. and
                      Kyriakos, K. and Grillo, I. and Philipp, M. and Jaksch, S.
                      and Tsitsilianis, C. and Papadakis, C. M.},
      title        = {{P}hysical {H}ydrogels via {C}harge {D}riven
                      {S}elf-{O}rganization of a {T}riblock {P}olyampholyte -
                      {R}heological and {S}tructural {I}nvestigations},
      journal      = {Macromolecules},
      volume       = {47},
      number       = {21},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2015-00382},
      pages        = {7561 - 7572},
      year         = {2014},
      abstract     = {We investigate the conformational properties of
                      stimuli-responsive hydrogels from triblock polyelectrolytes
                      PtBA-b-P2VP-b-PtBA (PtBA and P2VP are poly(tert-butyl
                      acrylate) and poly(2-vinylpyridine)) and the corresponding
                      polyampholytes PAA-b-P2VP-b-PAA (PAA is poly(acrylic acid)),
                      the latter with nonquaternized or quaternized P2VP blocks.
                      The block lengths are the same in all three polymers with
                      relatively short end blocks and long middle blocks. The
                      mechanical properties of the hydrogels have previously been
                      found to depend strongly on the pH value and on the nature
                      of the blocks ( Polymer 2008, 49, 1249). Here, we present
                      results from rheological studies and small-angle neutron
                      scattering revealing the underlying hydrogel structures. The
                      hydrogel structure of the polyampholyte depends on the
                      charge asymmetry, controlled by the pH value, and reveals
                      several transitions with increasing charge ratio. A low
                      charge asymmetry causes the collapse of the chains into
                      large globular structures due to the fluctuation-induced
                      attractions between oppositely charged moieties. In
                      contrast, at higher charge asymmetry, a network is formed.
                      The latter is also found for the polyelectrolyte system.
                      These results demonstrate the origin of the strong changes
                      in mechanical properties upon change of pH.},
      cin          = {Neutronenstreuung ; JCNS-1 / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II /
                      ICS-1 / IBG-1-TA},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)IBG-1-TA-20110204},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344905800033},
      doi          = {10.1021/ma501671s},
      url          = {https://juser.fz-juelich.de/record/186306},
}