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Conformational properties of hydroxypropylcellulose—II. Flow birefringence and optical anisotropy of hydroxypropylcellulose macromolecules

✍ Scribed by I.N. Shtennikova; G.F. Kolbina; V.P. Shibaev; I.V. Ekaeva

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
323 KB
Volume
26
Category
Article
ISSN
0014-3057

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✦ Synopsis

A~tract--The flow birefringence of solutions of hydroxypropylcellulose (HPC) in dimethylacetamide and tetrachloroethane has been investigated over a wide range of molecular weights. Comparison of the experimental dependence of shear optical coetficient [n]/[rt] on molecular weight with the theoretical dependence for rigid wormlike chains made it possible to determine the equilibrium rigidity of HPC molecules. The segment length thus determined is in good agreement with the evaluation of rigidity from viscometry and diffusion data. The optical anisotropy of HPC molecules, (~l -~2) = 500 x 10 2s cm 3 and the degree of their intramolecular orientational-axial order were determined.

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