Predictions of the semiphenomenological Doi–Ohta theory for the rheology and morphology of immiscible blends are compared to experimental data of a 40/60 blend of PMMA/PαMSAN with a co-continuous structure. Since the Doi–Ohta theory actually was developed for co-continuous blends, published comparisons on droplet–matrix blends are not considered as adequate. It is verified how the polymeric constituents contribute to the blend response and it is shown how the phenomenological parameters of the Doi–Ohta theory can be determined. Subsequently, these parameters are used to predict the morphology evolution and rheological response of the blend under oscillatory flow. The evolution of the storage modulus clearly reflects the changes in morphology of the blend over time and strain amplitude in agreement with the theoretical predictions. Below a critical strain amplitude the co-continuous structure will coarsen until a droplet–matrix morphology is generated but large strain amplitudes are effective enough to stop domain growth.
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November 2001
Research Article|
November 01 2001
Assessment of the Doi–Ohta theory for co-continuous blends under oscillatory flow
I. Vinckier;
I. Vinckier
Chemical Engineering Department, Katholieke Universiteit, Leuven, B-3001 Leuven, Belgium
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H. M. Laun
H. M. Laun
Polymer Research, Polymer Physics, BASF Aktiengesellschaft, D-67056 Ludwigshafen, Germany
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J. Rheol. 45, 1373–1385 (2001)
Article history
Received:
March 12 2001
Citation
I. Vinckier, H. M. Laun; Assessment of the Doi–Ohta theory for co-continuous blends under oscillatory flow. J. Rheol. 1 November 2001; 45 (6): 1373–1385. https://doi.org/10.1122/1.1410373
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