Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 26: POSTER Dynamics and Diffusion
CPP 26.6: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Molecular dynamics in semifluorinated side-chain Polyesters as studied by Broadband Dielectric Spectroscopy — •J Tsuwi1, F Kremer1, L Hartmann1, D Pospiech2, L Häußler2, and D Jehnichen2 — 1Institute for Experimental Physics I, University of Leipzig,Linné Straße 5, 04103 Leipzig,Germany — 2Leibniz-Institute of Polymer Research Dresden,Hohe Straße 6, 01069 Dresden, Germany
The molecular dynamics in fluorinated side-chain polyesters was studied using Broadband Dielectric Spectroscopy in the frequency range from 0.1Hz to 10MHz and temperatures between 120 K and 500 K.The chemical structure of the main chain was selectively varied in order to elucidate the effect of backbone flexibility on the molecular motion. It is observed that the fluorinated side-chain exhibits two relaxation processes γ and δ-like.The γ process is assigned to librational fluctuations at the terminal position of the side chain while the δ-like process reflects a cooperative motion of the side chain as a whole. Two more processes (α and β) are observed, which are associated with motion of the main chain. With respect to the flexibility of the main chain, an interesting behavior is seen in the dynamics of the backbone when compared to side chain motion. Based on the analysis of the activation plot, it is concluded that a flexible main chain exhibits faster mobility in direct contrast to its side chain motion.The dielectric results are discussed in the context of micro-phase separated layered structures, supported by recent data from DSC and t-SAXS.References[1]Tsuwi,J et.al;Coll.Polym.Sci.2005,283:1321[2]Tsuwi,J et.al;Macrom.2004,37:6050[3]Tsuwi,J et.al;J.Polym Sci.B:(submitted)