Confinement effects on the molecular dynamics of polymers with special architectures

• Antragsteller: Dr. Klaus-Jochen Eichhorn; Professor Dr. Friedrich Kremer
• Fachliche Zuordnung: Polymermaterialien
• Förderung: Förderung von 2006 bis 2012
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 18141116

• Erstellungsjahr: 2010

Zusammenfassung der Projektergebnisse

In conclusion, several relevant aspects for understanding the glassy dynamics of thin polymer layers have been revealed in the framework of the funded project: (a) Different analytical methods (ellipsometry, BDS, x-ray reflectometry, AC-calorimetry) show comparable results if applied under identical preparative and experimental conditions. (b) the impact of numerous preparative and experimental factors (solvent residues, stress, oxidation, degradation, chemical side reaction etc.) on the glassy dynamics of thin films, which can lead to metastable states was unravelled and was considered in these measurements. (c) Strong interfacial interactions (attractive / repulsive) may alter the glass transition temperature in thin films. (d) Confining the geometry (down to ~5 nm) does not influence the glassy dynamics of polystyrene. (e) The impact of topology (linear, dendritic) on Tg in thin films is only marginal.

Projektbezogene Publikationen (Auswahl)

• “Glassy dynamics and glass transition in thin polymer layers of PMMA deposited on different substrates“. Macromolecules
  M. Erber, M. Treß, E. U. Mapesa, A. Serghei, K.-J. Eichhorn, B. Voit, F. Kremer
  (Siehe online unter https://doi.org/10.1021/ma100912r)
• „A Convenient Room Temperature Polycondensation Toward Hyperbranched AB2-Type All-Aromatic Polyester with Phenol Terminal Groups”. J. Poly. Sci.: Part A: Poly. Chem., 47, 5158-5168 (2009)
  M. Erber, S. Boye, T. Hartmann, B. Voit, A. Lederer
  
• „Variations in the Glass Transition Temperature of Polyester with Special Architectures Confined in Thin Films”. Polymer, 51, 129-135 (2009)
  M. Erber, A. Khalyavina, K.-J. Eichhorn, B. Voit
  
• „New Approaches to Hyperbranched Poly(4-chloromethylstyrene) and Introduction of Various Functional End Groups by Polymer-Analogous Reactions“. J. Poly. Sci.: Part A: Poly. Chem., 48, 2224–2235 (2010)
  U. Georgi, M. Erber, J. Stadermann, M. Abulikemu, H. Komber, A. Lederer, B. Voit