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@ARTICLE{Ko:878453,
      author       = {Ko, Chia-Hsin and Claude, Kora-Lee and Niebuur, Bart-Jan
                      and Jung, Florian A. and Kang, Jia-Jhen and Schanzenbach,
                      Dirk and Frielinghaus, Henrich and Barnsley, Lester C. and
                      Wu, Baohu and Pipich, Vitaliy and Schulte, Alfons and
                      Müller-Buschbaum, Peter and Laschewsky, André and
                      Papadakis, Christine M.},
      title        = {{T}emperature-{D}ependent {P}hase {B}ehavior of the
                      {T}hermoresponsive {P}olymer {P}oly( {N}
                      -isopropylmethacrylamide) in an {A}queous {S}olution},
      journal      = {Macromolecules},
      volume       = {53},
      number       = {16},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2020-02859},
      pages        = {6816–6827},
      year         = {2020},
      abstract     = {Poly(N-isopropylmethacrylamide) (PNIPMAM) is a
                      thermoresponsive polymer, exhibiting lower critical solution
                      temperature (LCST) behavior in aqueous solution. We
                      investigate the temperature-dependent phase behavior of
                      PNIPMAM solutions in D2O using turbidimetry, differential
                      scanning calorimetry (DSC), small-angle and very small-angle
                      neutron scattering (SANS and VSANS), and Raman spectroscopy,
                      covering a large concentration range and compare the results
                      from PNIPMAM with the findings from its analogue
                      poly(N-isopropylacrylamide) (PNIPAM). We find that the
                      PNIPMAM chains only dehydrate 2-3 °C above the macroscopic
                      cloud point temperature, TCP. Even in the one-phase state,
                      loosely packed, large-scale inhomogeneities and physical
                      crosslinks are observed, and the chain conformation of
                      PNIPMAM is more compact than the one of PNIPAM. This is
                      attributed to the attractive intermolecular interactions
                      between the hydrophobic moieties. The phase transition of
                      PNIPMAM is broader than the one of PNIPAM. Upon heating to
                      the two-phase state, the PNIPMAM chains collapse and form
                      mesoglobules. These are larger and more hydrated than for
                      PNIPAM. This is attributed to the steric hindrance caused by
                      the additional methyl groups, which weaken the intrapolymer
                      interactions in the two-phase state. Thus, the methyl groups
                      in the backbone of the PNIPMAM chains have a significant
                      impact on the hydration and the structural behavior around
                      the phase transition.},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000566339100007},
      doi          = {10.1021/acs.macromol.0c01256},
      url          = {https://juser.fz-juelich.de/record/878453},
}