Rheological measurements and light-scattering experiments of dilute solutions of high molecular polystyrene. Light-scattering of flowing polymer solutions

Cleschinsky, D.; Stock, H. W.; Springer, Jürgen

doi:10.1007/bf00652533

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…Recently, interest in this approach was renewed and a few investigators have started to study flow light scattering of various polymer solutions in shear ,,− and elongational flows. Springer and co-workers have, to date, performed the most complete set of experiments on coil conformation by flow light scattering techniques.…”

Section: Introductionmentioning

confidence: 99%

Molecular Orientation and Deformation of Polymer Solutions under Shear: A Flow Light Scattering Study

1997

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The conformational characteristics of polymer coils in dilute solution under shear flow were investigated by means of wide angle laser light scattering in an apparatus similar to one used by Cottrell, Merrill, and Smith (J. Polym. Sci., Polym. Phys. Ed. 1969, 7, 1415). 1 The polymer solution was subjected to steady, homogeneous shear flow in the annulus between concentric cylinders by rotation of the inner cylinder. By examining the angular dependence of the scattered light intensity during shear, the orientation and the lengths of the major and minor axes of the deformed polymer molecules in solution were determined quantitatively. The solutions studied were linear polystyrenes of various molecular weights dissolved in the viscous solvent dioctyl phthalate near the Θ temperature. The shear rate dependence of the orientation angle of the deformed molecules was found to agree well with Zimm model predictions. The elastic dumbbell, Rouse, and Zimm models, however, substantially overpredict the degree of deformation of the polymer coils. This is in agreement with results of Link and Springer (Makromol.

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