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@ARTICLE{Krakovsk:281844,
      author       = {Krakovský, Ivan and Szekely, Noemi},
      title        = {{SANS} study on influence of temperature on nanophase
                      separation in epoxy-based hydrogels},
      journal      = {European polymer journal},
      volume       = {71},
      issn         = {0014-3057},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2016-01511},
      pages        = {336 - 351},
      year         = {2015},
      abstract     = {Effect of temperature on nanophase separated structure of
                      epoxy-based hydrogels containing polyoxyethylene (POE),
                      polyoxypropylene (POP) and diglycidyl ether of Bisphenol A
                      propoxylate (PDGEBA) was studied using small-angle neutron
                      scattering (SANS). At the macroscopic level, increase of
                      temperature causes an expulsion of water from the hydrogels.
                      At the microscopic level, the expulsion of water is
                      accompanied by redistribution of water and POE inside the
                      hydrogels. Two kinds of structure have been revealed in the
                      hydrogels by SANS. The structure with shorter characteristic
                      length measured by Bragg’s distance (ca 70–80 Å) is
                      observed in all hydrogels and at all investigated
                      temperatures (5–80 °C). It is attributed to a
                      distribution of water into water-rich and water-poor domains
                      caused by nanophase separation of the crosslinked system due
                      to differences in interaction of individual network building
                      blocks with water. The water-rich domains consist of a part
                      of POE blocks mixed with water. The water-poor domains
                      consist of POP and PDGEBA blocks mixed with a small amount
                      of water and remaining POE blocks. The domains are separated
                      by a diffuse interface with effective thickness ca 7–10 Å
                      as estimated from deviations from Porod’s law. Formation
                      of a new structure with longer characteristic length (ca 240
                      Å) is observed in the highly non-stoichiometric hydrogels.
                      Its contribution to SANS becomes more pronounced with
                      increasing temperature. This contribution is attributed to
                      the formation of regions of pure water (water pools) as a
                      new hydrogel phase that is enabled by low network density
                      and high amount of pending chains in the highly
                      non-stoichiometric epoxy networks subject to swelling.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {670},
      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:000362603800027},
      doi          = {10.1016/j.eurpolymj.2015.08.009},
      url          = {https://juser.fz-juelich.de/record/281844},
}