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@ARTICLE{Popescu:201061,
      author       = {Popescu, Maria-Teodora and Tsitsilianis, Constantinos and
                      Papadakis, Christine M. and Adelsberger, Joseph and Balog,
                      Sandor and Busch, Peter and Hadjiantoniou, Natalie A. and
                      Patrickios, Costas S.},
      title        = {{S}timuli-{R}esponsive {A}mphiphilic {P}olyelectrolyte
                      {H}eptablock {C}opolymer {P}hysical {H}ydrogels: {A}n
                      {U}nusual p{H}-{R}esponse},
      journal      = {Macromolecules},
      volume       = {45},
      number       = {8},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2015-03371},
      pages        = {3523 - 3530},
      year         = {2012},
      abstract     = {An amphiphilic cationic polyelectrolyte based on
                      poly[2-(dimethylamino)ethyl methacrylate] (polyDMA) and
                      poly(n-butyl methacrylate) (polyBuMA) with a
                      BuMA–DMA–BuMA–DMA–BuMA–DMA–BuMA heptablock
                      copolymer architecture was studied in aqueous media. This
                      copolymer was found to form a physical hydrogel via the
                      intermolecular hydrophobic association (physical
                      cross-linking) of the BuMA blocks. The rheological
                      properties of the heptablock hydrogels were investigated as
                      a function of copolymer concentration, and pH. The results
                      showed a peculiar pH-dependence of the rheological
                      properties, remarkably different from those observed with
                      associative telechelic polyelectrolytes. Aqueous solutions
                      of this copolymer were free-flowing sols at low pH (below 2)
                      and high pH (above 8), whereas they turned into gels at
                      intermediate pH values. The rheological properties studied
                      as a function of pH showed two additional
                      stiff–soft–stiff gel transitions at pH 4.5 and 6.5.
                      Small-angle neutron scattering revealed the formation of a
                      3D transient network of bridged flower-like micelles whose
                      structural characteristics, i.e., micellar radius,
                      hard-sphere radius and hard-sphere volume fraction, were
                      smoothly evolving with the pD.},
      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          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000303083900027},
      doi          = {10.1021/ma300222d},
      url          = {https://juser.fz-juelich.de/record/201061},
}