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@ARTICLE{Dyakonova:280653,
      author       = {Dyakonova, Margarita A. and Berezkin, Anatoly V. and
                      Kyriakos, Konstantinos and Gkermpoura, Sandra and Popescu,
                      Maria T. and Filippov, Sergey K. and Štěpánek, Petr and
                      Di, Zhenyu and Tsitsilianis, Constantinos and Papadakis,
                      Christine M.},
      title        = {{S}alt-{I}nduced {C}hanges in {T}riblock {P}olyampholyte
                      {H}ydrogels: {C}omputer {S}imulations and {R}heological,
                      {S}tructural, and {D}ynamic {C}haracterization},
      journal      = {Macromolecules},
      volume       = {48},
      number       = {22},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2016-00417},
      pages        = {8177 - 8189},
      year         = {2015},
      note         = {FINAL DRAFT POST REFEREE wird nicht zur Verfügung
                      gestellt, Mic 15.01.2016},
      abstract     = {We investigate the influence of ionic strength on the
                      structural properties of stimuli-responsive hydrogels from
                      triblock polyampholytes PAA-b-P2VP-b-PAA (PAA and P2VP are
                      negatively charged poly(acrylic acid) and positively charged
                      poly(2-vinylpyridine)). In our previous studies, we found
                      that the transition behavior depends on the charge asymmetry
                      which is controlled by pH and which alters the degree of
                      ionization of the two types of blocks [Dyakonova
                      Macromolecules 2014, 47, 7561]. The same triblock
                      polyampholyte, but with chemically quaternized P2VP (QP2VP)
                      instead of P2VP as the middle block, is highly positively
                      charged, independently of pH. In the present investigation,
                      PAA-b-P2VP-b-PAA at pH 3 and PAA-b-PQ2VP-b-PAA at pH 5 were
                      chosen to investigate the influence of the ionic strength on
                      the micellar network morphology by adding NaCl at
                      concentrations in the physiological range. Computer
                      simulations of the latter system show that salt addition
                      results in the formation of larger complexes due to
                      increased hydrophobicity in the system upon screening of
                      charges and that the distance between these complexes
                      increases accordingly. Rheological studies reveal that the
                      hydrogels from PAA-b-P2VP-b-PAA at pH 3 become softer when
                      the ionic strength is above 0.10 M. Small-angle neutron
                      scattering studies have indicated that, in salt-free
                      solution, both systems form networks. Particularly, it was
                      found that in PAA-b-PQ2VP-b-PAA, which has a high charge
                      asymmetry, a variation of the ionic strength leads to
                      significant changes in network architecture. In contrast, in
                      PAA-b-P2VP-b-PAA at pD 3, which has a lower charge asymmetry
                      and the morphology is less sensitive to salt, because the
                      hydrophobic effect prevails. These findings demonstrate that
                      the different response of the two systems to the variation
                      of ionic strength is a consequence of the nature of the
                      predominant interactions, namely charge screening and
                      hydrophobic interactions.},
      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:000365463900014},
      doi          = {10.1021/acs.macromol.5b01746},
      url          = {https://juser.fz-juelich.de/record/280653},
}