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Conformational and optical properties of (acetoxypropyl)cellulose molecules in solutions

✍ Scribed by I.N. Shtennikova; E.V. Korneeva; G.F. Kolbina; I.A. Strelina; P.N. Lavrenko; V.P. Shibaev; I.V. Ekaeva

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 460 KB
Volume: 28
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(92)90253-x

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✦ Synopsis

Almtraet--The molecular properties of oxypropyl cellulose acetate (APC) with an average molar degree of substitution DS = 2.25 were investigated by flow birefringence, sedimentation, diffusion and viscometry. In the range of molecular weight (M) from 3 • 103 to 202 • 103, the relationships between intrinsic viscosity, sedimentation and diffusion coetficients and M were established. The length of a statistical Kuhn segment A = (180 + 10)A and the diameter of the molecule d = (17 ± 3)A were calculated from hydrodynamic data with the application of the worm-like chain model. The optical anisotropy of the molecular segment is positive (400.10 -25 cm3). The dependence of the shear optical coefficient [n]/[r/] on M was used for determination of the equilibrium rigidity of molecules. The optical data gave the segment length AFB = (170 + 10) A in agreement with the above value of A. The data were compared to the characteristics of cellulose esters and other ethers with similar structures.

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