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On the Rouse spectrum and the determination of the molecular weight distribution from rheological data
Maier et al. [Maier, D., et al., J. Rheol. 42, 1153–1173 (1998)] examined the reconstruction of binary molecular weight distributions from rheological data for a series of polystyrene mixtures using a generalized mixing rule recently introduced [Anderssen, R. S. and D. W. Mead, J. Non-Newtonian Flui...
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Published in: | Journal of rheology (New York : 1978) 2000-03, Vol.44 (2), p.429-438 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Maier et al. [Maier, D., et al., J. Rheol. 42, 1153–1173 (1998)] examined the reconstruction of binary molecular weight distributions from rheological data for a series of polystyrene mixtures using a generalized mixing rule recently introduced [Anderssen, R. S. and D. W. Mead, J. Non-Newtonian Fluid Mech. 76, 299–306 (1998)]. They found an unexpected high value for
β(β=3.84±0.1)
, the mixing parameter, which is 1 for the reptation and 2 for the double reptation or entanglement models. This result can be understood when the relaxation time spectrum is decomposed into a Rouse and an entanglement part and only the latter is used for determination of the molecular weight distribution. Applying a procedure which separates the Rouse processes from the spectrum determined from measured dynamic shear moduli,
β
values are found which are in accordance with the double reptation theory and which give very good agreement between molecular weight distributions determined by size-exclusion chromatography and by rheological data evaluation. |
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ISSN: | 0148-6055 1520-8516 |
DOI: | 10.1122/1.551094 |