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@ARTICLE{Rathgeber:45663,
      author       = {Rathgeber, S. and Pakula, T. and Wilk, A. and
                      Matyjaszewski, K. and Beers, K. L.},
      title        = {{O}n the shape of bottle-brush macromolecules: {S}ystematic
                      variation of architectural parameters},
      journal      = {The journal of chemical physics},
      volume       = {122},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-45663},
      pages        = {124904-1 - 124904-13},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {We measured the form factor of bottle-brush macromolecules
                      under good solvent conditions with small-angle neutron
                      scattering and static light scattering. The systems under
                      investigation are brushes, synthesized via the grafting-from
                      route, built from a poly(alkyl methacrylate) backbone to
                      which poly(n-butyl acrylate) side chains are densely
                      grafted. The aim of our work is to study how the systematic
                      variation of structural parameters such as the side chain
                      length and backbone length change the conformation of the
                      polymer brushes in solution. All spectra can be consistently
                      described by a model, considering the bottle-brush polymers
                      as flexible rods with internal density fluctuations.
                      Parameters discussed are (1) the contour length per main
                      chain monomer l(b), (2) the fractal dimension of the side
                      chains Ds, as well as (3) the fractal dimension D, and (4)
                      the Kuhn length lambdak of the overall brush.
                      l(b)=0.253+/-0.008 nm is found to be independent of the side
                      chain length and equal to the value found for the bare main
                      chain, indicating a strongly stretched conformation for the
                      backbone due to the presence of the side chains. The fractal
                      dimension of the side chains is determined to be
                      Ds=1.75+/-0.07 which is very close to the value of 10.588
                      approximately 1.70 expected for a three-dimensional
                      self-avoiding random walk (3D-SAW) under good solvent
                      conditions. On larger length scales the overall brush
                      appears to be a 3D-SAW itself (D=1.64+/-0.08) with a
                      Kuhn-step length of lambdak=70+/-4 nm. The value is
                      independent of the side chain length and 46 times larger
                      than the Kuhn length of the bare backbone (lambdak=1.8+/-0.2
                      nm). The ratio of Kuhn length to brush diameter
                      lambda(k)d>or=20 determines whether lyotropic behavior can
                      be expected or not. Since longer side chains do not lead to
                      more persistent structures, lambda(k)d decreases from 8 to 4
                      with increasing side chain length and lyotropic behavior
                      becomes unlikely.},
      keywords     = {J (WoSType)},
      cin          = {IFF-IWM},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB343},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:15836421},
      UT           = {WOS:000228287900059},
      doi          = {10.1063/1.1860531},
      url          = {https://juser.fz-juelich.de/record/45663},
}