B08 Broadband dielectric spectroscopy to study molecular dynamics in nanometer thin layers of blockcopolymers.

Tuesday 30. June 2015

The project B08 went through some changes over time. The project investigated :

  1. Broadband dielectric spectroscopy to study molecular dynamics in nanometer thin layers of blockcopolymers in the first funding period:
    2011-2015

  2. Broadband dielectric and IR spectroscopy to study molecular dynamics and order in nanometer domains of endfixed polymers in the second funding period: 2015-2019

  3. Refined Infrared Spectroscopy to Study Molecular Orientation and Order in Heterogeneous Polymer Systems in the third funding period: 2019-2023
Kremer

While the structure of block copolymers was well explored, knowledge concerning their molecular dynamics was sparse. Broadband Dielectric Spectroscopy (BDS) using nano-structured electrode arrangements had proven to be a versatile tool in studying the molecular dynamics in thin homogeneous polymer layers. In the proposed project, it was planned to extend these experiments to nanometer thin layers of block copolymers. By that, the effect of an internal constraint due to micro-phase separation but as well due to an external restriction of the one-dimensional confinement in nanometer thin layers would be unraveled. In the special case of poly(styrene)-blockpoly(isoprene), it was possible to study in the polyisoprene block two processes, the segmental relaxation and a fluctuation of the end-to-end vector. This offered an additional means for studying the molecular dynamics at two different length scales. Special emphasis was given to the interplay between structure and dynamics in the different mesophases of the block copolymers. Furthermore, the impact of appropriate (chemically patterned) surfaces was analyzed.

Highlighted Publications:
  1.  Mapesa, E.U., M. Tress, G. Schulz, H. Huth, C. Schick, M. Reiche, F. Kremer, Segmental and chain dynamics in nanometric layers of poly (cis-1,4-isoprene) as studied by Broadband Dielectric Spectroscopy and temperature-modulated Calorimetry, Soft Matter 9 (44), 10592–10598 (2013) 

  2.  Tress, M., E.U. Mapesa, W. Kossack, W.K. Kipnusu, M. Reiche, F. Kremer, Glassy Dynamics in Condensed Isolated Polymer Chains, Science 341 (6152) 1371-1374 (2013) 

  3. Neubauer, N., R. Winkler, M. Tress, P. Uhlmann, M. Reiche, W.K. Kipnusu, F. Kremer,  Glassy dynamics of Poly(2-Vinyl-Pyridine) brushes with varying grafting density, Soft Matter 11, 3062-62015 (2015) 

    Other publications of this group:

    The Initial Molecular Interactions in the Course of Enthalpy Relaxation and Nucleation in Polyethylene Terephthalate (PET) as Monitored by Combined Nanocalorimetry and FTIR Spectroscopy
    Wycliffe Kiprop Kipnusu, Evgeny Zhuravlev, Christoph Schick, Friedrich Kremer,The Initial Molecular Interactions in the Course of Enthalpy Relaxation and Nucleation ...
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    Orientation Polarization Spectroscopy—Toward an Atomistic Understanding of Dielectric Relaxation Processes
    Friedrich Kremer, Wycliffe Kiprop Kipnusu, Martin Fränzl,Open AccessCommunication Orientation Polarization Spectroscopy—Toward an Atomistic Understanding of Dielectric Relaxation ProcessesInt. J. Mol ...
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    Homogeneous nucleation in polyamide 66, a two‑stage process as revealed by combined nanocalorimetry and IR spectroscopy
    Wycliffe Kiprop Kipnusu, Evgeny Zhuravlev, Christoph Schick, Friedrich Kremer,Homogeneous nucleation in polyamide 66, a two‑stage process as revealed by combined ...
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    Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells
    Shahidul Alam, Vojtech Nadazdy, Tomas Vary, Christian Friebe, Rico Meitzner, Johannes Ahner, Aman Anand, Safakath Karuthedath, Catherine S. P. De ...
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    Tuning the glass transition of siloxane-based poly(ionic liquid)s towards high ion conductivity
    Manuel Reiter, Arthur Markus Anton, Jian Chang, Friedrich Kremer, Miriam M. Unterlass, Jiayin Yuan,Tuning the glass transition of siloxane-based poly(ionic ...
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