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@ARTICLE{Perfetti:844242,
      author       = {Perfetti, Marco and Russo Krauss, Irene and Radulescu,
                      Aurel and Ruocco, Nino and D'Errico, Gerardino and
                      Bianchetti, Giulia Ottavia and Paduano, Luigi},
      title        = {{P}oly-ethylene-vinyl alcohol microgels prepared through
                      salting out: {R}ationalizing the aggregation process and
                      tuning the microstructural properties},
      journal      = {Polymer},
      volume       = {137},
      issn         = {0032-3861},
      address      = {Oxford},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-01683},
      pages        = {122 - 131},
      year         = {2018},
      abstract     = {The ion-specific effect on the solubility of macromolecules
                      in water, rationalized through the Hofmeister series, can be
                      used as an effective method to obtain polymer particles with
                      desired microstructural properties thanks to the so-called
                      salting out effect. By choosing the proper salt and
                      optimizing the polymer and the salt concentration, it is
                      possible to tailor the particle structural features like the
                      radius and the degree of compactness and to speed up the
                      aggregation process until complete conversion from free
                      chains to aggregates. Here we rationalize the segregation of
                      poly-ethylene-vinyl alcohol (EVOH) chains in the presence of
                      sodium chloride (NaCl). The effect of polymer and salt
                      concentrations on the kinetics and the thermodynamics of the
                      aggregation process is considered. In particular, we show
                      how such parameters influence the microstructural properties
                      of the particles through a combination of light and neutron
                      scattering techniques as well as microscopy. We found that
                      by increasing sodium chloride concentration it is possible
                      to speed up the aggregation process, obtaining a complete
                      conversion from free chains to aggregates at shorter times,
                      whereas increasing poly-ethylene-vinyl alcohol concentration
                      from $0.70\%$ w/w to $1.30\%$ w/w determines an increase of
                      the microgel size of a two-times factor. Moreover, NaCl
                      concentration directly affects both the packing degree of
                      the polymer chains within the aggregate and the morphology
                      of the polymer particle, leading to a more compact structure
                      at higher NaCl concentrations. Understanding how it is
                      possible to tune both aggregation kinetics and EVOH particle
                      microstructure is fundamental in order to give a general
                      picture which could be broadened to the class of vinyl
                      alcohol-based polymers.},
      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:000425603800013},
      doi          = {10.1016/j.polymer.2018.01.018},
      url          = {https://juser.fz-juelich.de/record/844242},
}