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Determination of molecular parameters from polymer solutions in shear flow
Author(s) -
Link Alfred,
Zisenis Mathias,
Prötzl Brigitte,
Springer Jürgen
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920610128
Subject(s) - radius of gyration , gyration , polystyrene , scattering , polymer , light scattering , materials science , shear flow , shear (geology) , optics , molecular physics , excluded volume , anisotropy , wavelength , cylinder , chemistry , physics , mechanics , composite material , geometry , mathematics
A light scattering photometer with a double cylinder shear cell has been developed which allows detection not only in one plane as usual, but in a half‐spherical range around the scattering volume. The anisotropic scattering behavior of oriented and deformed polymer molecules in dilute solution was investigated. All measurements were performed on polystyrene in several viscous solvents. From measurements in the plane of flow the average orientation angle was determined. By variation of detector position and wavelength of the primary beam, the determination of all three axes of the molecular gyration space of polymer coils was possible. Compared to predictions of the well‐known dynamic theories by Kuhn, Rouse and Zimm, corresponding orientation data were found while the molecular deformation ratio shows much lower values than expected.