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Microphase Reorientation in a Block Copolymer Melt as Detected by FT-Rheology and 2D-SAXS

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48252

Langela,  M.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons49003

Wilhelm,  Manfred
MPI for Polymer Research, Max Planck Society;

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Zitation

Langela, M., & Wilhelm, M. (2003). Microphase Reorientation in a Block Copolymer Melt as Detected by FT-Rheology and 2D-SAXS. In Proceedings of the 3nd International Symposium on Food Rheology and Structure (pp. 229-233).


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-6321-4
Zusammenfassung
The alignment kinetics for the orientation/reorientation behavior of the microphase of a lamellar PS-b-PI diblock copolymer under large amplitude oscillatory shear (LAOS) at a shear frequency ω1/2π is studied. This blockpolymer serves as a model compound for complex morphologies and textures. The degree of mechanical nonlinearity was online monitored via the intensity of the mechanical higher harmonic response at 3ω1 during the orientation nd reorientation process (FT-Rheology). FT-Rheology was combined with an quantification of the orientation using 2-dimensional small angle X-ray scattering (2D-SAXS). Within this study the kinetics of the change in macrophase alignment from the parallel to the perpendicular orientation is induced by applying two different oscillatory shear conditions. Improved parallel alignment after increasing the shear frequency as well as spatial heterogeneous alignment kinetics are detected. Thus, FT-Rheology offers a new and simple way for online monitoring for orientation kinetics in complex materials e.g. in foods.