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@ARTICLE{PuigRigall:844926,
      author       = {Puig-Rigall, Joan and Obregon-Gomez, Ines and
                      Monreal-Pérez, Pablo and Radulescu, Aurel and
                      Blanco-Prieto, María J. and Dreiss, Cécile A. and
                      González-Gaitano, Gustavo},
      title        = {{P}hase behaviour, micellar structure and linear rheology
                      of tetrablock copolymer {T}etronic 908},
      journal      = {Journal of colloid and interface science},
      volume       = {524},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-02268},
      pages        = {42 - 51},
      year         = {2018},
      abstract     = {Tetronics are X-shaped block-copolymers of polyethylene
                      oxide and polypropylene oxide, which self-assemble into
                      micelles and can undergo a sol-gel transition; these
                      transitions are dependent on temperature, concentration but
                      also pH, due to the central diamine group of the tetrablock.
                      We report the nanoscale morphologies underlying these
                      different phases and the rheology of the systems for a very
                      large, highly hydrophilic block copolymer, Tetronic 908,
                      through the combined use of oscillatory rheology,
                      steadyblock-state and time-resolved fluorescence,
                      small-angle neutron scattering (SANS), dynamic light
                      scattering (DLS) and Fourier transform infrared attenuated
                      total reflectance (FTIR-ATR). At low concentrations, SANS
                      reveal core-shell micelles of ca. 10 nm radius, presenting
                      a dehydrated core and a highly hydrated shell, with
                      relatively small aggregation numbers (Nagg ≈ 13). The
                      micelles are notably affected by the pH, due to the
                      protonation of the central amine spacer at low pH (pH ≈
                      2), which shifts micellization to higher temperature, with
                      smaller micelles than at natural pH. In the intermediate
                      concentration regime $(10–15\%),$ micelles become smaller
                      (Nagg ≈ 5), and present a higher hydration of the core. In
                      the high concentration regime, Tetronic 908 undergoes a
                      sol-gel transition above a threshold temperature, which is
                      fully inhibited at acidic pH. SANS data from the gel phase
                      reveal a BCC order of tightly packed spheres. Temperature
                      sweeps in oscillatory rheology show a shift of the onset of
                      gelation towards lower temperatures as concentration
                      increases, an increase in the elastic modulus G′ and an
                      expansion of gel region over a larger range of temperatures.
                      SANS and rheology reveal that at pH below the natural pH
                      (ca. 8), gelation is shifted to higher temperatures, but the
                      morphology of the gels is similar, while under highly acidic
                      conditions the gelation is fully suppresed.},
      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},
      pubmed       = {pmid:29631218},
      UT           = {WOS:000434494400006},
      doi          = {10.1016/j.jcis.2018.03.096},
      url          = {https://juser.fz-juelich.de/record/844926},
}