@article{SiegmannMoellerBeuermann2012,
  author    = {Siegmann, Rebekka and M{\"o}ller, Eleonore and Beuermann, Sabine},
  title     = {Propagation rate coefficients for homogeneous phase VDF-HFP copolymerization in supercritical CO2},
  series = {Macromolecular rapid communications},
  volume    = {33},
  journal   = {Macromolecular rapid communications},
  number    = {14},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1022-1336},
  doi       = {10.1002/marc.201200115},
  pages     = {1208 -- 1213},
  year      = {2012},
  abstract  = {For the first time, propagation rate coefficients, kp,COPO, for the copolymerizations of vinylidene fluoride and hexafluoropropene have been determined. The kinetic data was determined via pulsed-laser polymerization in conjunction with polymer analysis via size-exclusion chromatography, the PLP-SEC technique. The experiments were carried out in homogeneous phase with supercritical CO2 as solvent for temperatures ranging from 45 to 90 degrees C. Absolute polymer molecular weights were calculated on the basis of experimentally determined MarkHouwink constants. The Arrhenius parameters of kp,COPO vary significantly compared with ethene, which is explained by the high electronegativity of fluorine and less intra- and intermolecular interactions between the partially fluorinated macroradicals.},
  language  = {en}
}
@article{BarthSiegmannBeuermannetal.2012,
  author    = {Barth, Johannes and Siegmann, Rebekka and Beuermann, Sabine and Russell, Gregory T. and Buback, Michael},
  title     = {Investigations into chain-length-dependent termination in bulk radical polymerization of 1H, 1H, 2H, 2H-Tridecafluorooctyl methacrylate},
  series = {Macromolecular chemistry and physics},
  volume    = {213},
  journal   = {Macromolecular chemistry and physics},
  number    = {1},
  publisher = {Wiley-Blackwell},
  address   = {Malden},
  issn      = {1022-1352},
  doi       = {10.1002/macp.201100479},
  pages     = {19 -- 28},
  year      = {2012},
  abstract  = {The SP-PLP-EPR technique is used to carry out a detailed investigation of the radical termination kinetics of 1H, 1H, 2H, 2H-tridecafluorooctyl methacrylate (TDFOMA) in bulk at relatively low conversion. Composite-model behavior for chain-length-dependent termination rate coefficients, kti,i, is observed. It is found that for TDFOMA, ic approximate to 60 independent of temperature, and as approximate to 0.65 and al approximate to 0.2 at 80 degrees C and above. However, at lower temperatures the situation is strikingly different, with the significantly higher average values of as = 0.89 +/- 0.15 and al = 0.32 +/- 0.10 being obtained at 50 degrees C and below. This makes TDFOMA the first monomer to be found that exhibits clearly different exponent values, as and al, at lower and higher temperature, and that has both a high as, like an acrylate, and a high ic, like a methacrylate.},
  language  = {en}
}