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Microphase reorientation in block copolymer melts as detected via FT rheology and 2D SAXS

MPS-Authors
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/persons49000

Wiesner,  U.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48786

Spiess,  Hans Wolfgang
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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Citation

Langela, M., Wiesner, U., Spiess, H. W., & Wilhelm, M. (2002). Microphase reorientation in block copolymer melts as detected via FT rheology and 2D SAXS. Macromolecules, 35(8), 3198-3204.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-661F-5
Abstract
The alignment kinetics of the orientation/reorientation behavior of the microphase of a lamellarPS-b-PI diblock copolymer under large-amplitude oscillatory shear conditions is studied. By online monitoring the degree of the mechanical nonlinearity during the orientation process-as determined via the higher harmonics in Fourier transform (FT) rheology-and investigation of the orientational distribution by 2- dimensional small-angle X-ray scattering, we followed the kinetics of the microphase alignment for two different experimental shear conditions, Improved parallel alignment after increasing the shear frequency as well as spatially heterogeneous alignment via bimodal: parallel and perpendicular alignment of the lamellae is detected by both methods. Thus, FT rheology offers a new and simple way for online monitoring complex reorientation kinetics.