Maiko Tsuda, K. Terao, Yasuko Nakamura
Jun 11, 2010
Citations
0
Influential Citations
23
Citations
Journal
Macromolecules
Abstract
Five amylose tris(3,5-dimethylphenylcarbamate) (ADMPC) samples ranging in weight-average molecular weight Mw from 1.7 × 104 to 3.4 × 105 were studied by light and small-angle X-ray scattering, sedimentation equilibrium, and viscometry in methyl acetate (MEA), 2-butanone (MEK), and 4-methyl-2-pentanone (MIBK) at 25 °C. Seven amylose tris(phenylcarbamate) (ATPC) samples whose Mw ranges between 2 × 104 and 3 × 106 were also investigated in MEK at 25 °C. The radii of gyration, particle scattering functions, and intrinsic viscosities determined as a function of Mw were analyzed in terms of the cylindrical wormlike chain model mainly to determine the Kuhn segment length λ−1 and the contour length h (or the helix pitch) per residue. While the obtained h values (0.36−0.38 nm) of ADMPC are quite insensitive to the solvents, the λ−1 value not only is 1.5−3 times larger than that of ATPC in the corresponding solvent but also significantly increases with an increase of the molar volume of the solvent, and it reaches ...