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pro vyhledávání: '"Thomas Plesnivy"'
Autor:
Thomas Plesnivy, Brigitta Huckestein
Publikováno v:
Chemie in unserer Zeit. 34:276-286
Heute existieren prinzipiell fur alle Altkunststoffe geeignete Verwertungsverfahren. Welches jedoch im Einzelfall zur Anwendung kommt, hangt von einer Reihe von okologischen, okonomischen und technologischen Kriterien ab und wird nicht zuletzt von de
Induction of liquid crystalline phases in linear polyamines by complexation of transition metal ions
Publikováno v:
Journal of Materials Chemistry. 8:343-351
In this paper, we describe the preparation and characterization of polyamine–copper complexes based onN-alkylated polyethyleneimines which were obtained by polymer analogous reduction of the corresponding N-acylated polymers. Liquid crystalline pro
Publikováno v:
Macromolecular Chemistry and Physics. 197:3881-3895
The molecular dynamics and the charge transport in six liquid crystalline N-acylated oligoethylenimines were investigated by dielectric spectroscopy. The dielectric spectra in the temperature range from 125 K up to 400 K and in the frequency range be
Autor:
Gerald Brezesinski, Helmut Ringsdorf, Markus Seitz, Bernd Struth, Jon A. Preece, Thomas Plesnivy
Publikováno v:
Thin Solid Films. :304-307
Poly-N-4-decyloxybenzoylethyleneimine, highly crystalline in bulk, forms a stable monolayer at the air-water interface which undergoes a reversible collapse into a probable bilayer structure at higher surface pressures. We achieved transfer both from
Autor:
Shiro Kobayashi, Martin R. Edelmann, Hiroshi Uyama, Helmut Ringsdorf, Hartmut Fischer, Thomas Plesnivy, Klaus Schimossek, Markus Seitz
Publikováno v:
Macromolecules. 29:6560-6574
The formation of columnar mesophases by N-acylated azacrown derivatives may be seen as a consequence of their discoid molecular geometry. Viewing these materials as cyclic oligomers, they are just one example of the various molecular architectures th
Autor:
Peter Schuhmacher, Paul A. Heiney, Jack Yitzhak Josefowicz, Nicholas C. Maliszewskyj, Helmut Ringsdorf, Thomas Plesnivy
Publikováno v:
Langmuir. 11:1666-1674
We have used atomic force microscopy (AFM) and X-ray diffraction (XRD) to study ultrathin films of star-shaped oligomeric molecules with mesogenic triphenylene subunits. At the air-water interface, the molecules undergo a conformational change such t
Autor:
Hartmut Fischer, Thomas Plesnivy, Helmut Ringsdorf, Surya S. Ghosh, Paul A. Heiney, Markus Seitz, Nicholas C. Maliszewskyj
Publikováno v:
Angewandte Chemie-International Edition, 34(7), 795-798. Wiley
Both discotic molecules and certain linear polymers form columnar hexagonal mesophases. Whereas the dislike structure of the macrocycle 1 is dictated by the molecular shape, in polymer 2 it is presumably enforced by a helical folding of the polymer's
Autor:
François Diederich, Ulrich Jonas, Helmut Ringsdorf, Ludovic Jullien, Thomas Plesnivy, David Weinstein, Carlo Thilgen, Joehem Effing
Publikováno v:
Angewandte Chemie International Edition in English. 31:1599-1602
Autor:
Helmut Ringsdorf, Thomas Plesnivy, David Weinstein, Ludovic Jullien, Ulrich Jonas, Carlo Thilgen, Jochem J. Effing, François Diederich
Publikováno v:
Angewandte Chemie. 104:1683-1686
Publikováno v:
Makromolekulare Chemie. Macromolecular Symposia. 64:19-32
The game of molecular engineering of LC systems via combination of molecular architecture and functionalization of mesogens has opened interesting perspectives in the field of liquid crystals. This contribution summarizes different examples of this i