% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Ruocco:825286,
      author       = {Ruocco, N. and Auhl, D. and Bailly, C. and Lindner, P. and
                      Pyckhout-Hintzen, W. and Wischnewski, A. and Leal, L. G. and
                      Hadjichristidis, N. and Richter, D.},
      title        = {{B}ranch {P}oint {W}ithdrawal in {E}longational {S}tartup
                      {F}low by {T}ime-{R}esolved {S}mall {A}ngle {N}eutron
                      {S}cattering},
      journal      = {Macromolecules},
      volume       = {49},
      number       = {11},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2016-07750},
      pages        = {4330 - 4339},
      year         = {2016},
      abstract     = {We present a small angle neutron scattering (SANS)
                      investigation of a blend composed of a dendritic polymer and
                      a linear matrix with comparable viscosity in start-up of an
                      elongational flow at Tg + 50. The two-generation dendritic
                      polymer is diluted to $10\%$ by weight in a matrix of a long
                      well-entangled linear chains. Both components consist of
                      mainly 1,4-cis-polyisoprene but differ in isotopic
                      composition. The resulting scattering contrast is
                      sufficiently high to permit time-resolved measurements of
                      the system structure factor during the start-up phase and to
                      follow the retraction processes involving the inner sections
                      of the branched polymer in the nonlinear deformation
                      response. The outer branches and the linear matrix, on the
                      contrary, are in the linear deformation regime. The linear
                      matrix dominates the rheological signature of the blend and
                      the influence of the branched component can barely be
                      detected. However, the neutron scattering intensity is
                      predominantly that of the (branched) minority component so
                      that its dynamics is clearly evident. In the present paper,
                      we use the neutron scattering data to validate the branch
                      point withdrawal process, which could not be unambiguously
                      discerned from rheological measurements in this blend. The
                      maximal tube stretch that the inner branches experience,
                      before the relaxed outer arm material is incorporated into
                      the tube is determined. The in situ scattering experiments
                      demonstrate for the first time the leveling-off of the
                      strain as the result of branch point withdrawal and chain
                      retraction directly on the molecular level. We conclude that
                      branch point motion in the mixture of architecturally
                      complex polymers occurs earlier than would be expected in a
                      purely branched system, presumably due to the different
                      topological environment that the linear matrix presents to
                      the hierarchically deep-buried tube sections.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-2 / PGI-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000378016200034},
      doi          = {10.1021/acs.macromol.5b02786},
      url          = {https://juser.fz-juelich.de/record/825286},
}