学術雑誌論文

学術雑誌論文

text

Macromolecules. 2013, 46(13), p. 5355-5362

Solution properties of a cyclic chain having tunable chain stiffness: Cyclic amylose tris(n-butylcarbamate) in theta and good solvents

American Chemical Society

英語

text

2013-07-21

https://doi.org/10.1021/ma400774r

Terao K., Shigeuchi K., Oyamada K., et al. Solution properties of a cyclic chain having tunable chain stiffness: Cyclic amylose tris(n-butylcarbamate) in Θ and good solvents. Macromolecules, 46, 13, 5355. https://doi.org/10.1021/ma400774r.

Small-angle X-ray scattering measurements were made for nine cyclic amylose tris(n-butylcarbamate) (cATBC) samples ranging in the weight-average molar mass Mw from 1.6 × 104 to 1.1 × 105 to determine the z-average mean-square radius of gyration «S 2»z and the particle scattering function P(q) in two good solvents, tetrahydrofuran (THF) and methanol (MeOH) at 25 °C and in a Θ solvent, 2-propanol (2PrOH) at the Θ temperature (35 °C). Static and dynamic light scattering measurements were carried out for cATBC in 2PrOH to determine Mw, the second virial coefficient A2, and the hydrodynamic radius RH. The dimensional and hydrodynamic properties are consistently explained by the current theories for wormlike ring having substantially the same model parameters obtained for linear analogues, that is, the Kuhn segment length λ-1 of THF, 2PrOH, and MeOH are 75, 20, and 11 nm, respectively. Furthermore, number of hydrogen bonds decreases with the order of THF, 2PrOH, and MeOH, as is the case with linear ATBC. These results indicate that cATBC has rigid helical backbone stabilized by intramolecular hydrogen bonds in THF and it loosens with increasing solvent polarity. Indeed, lyotropic liquid crystallinity was found for cATBC in THF. In the Θ condition, 2PrOH at 35 °C, cATBC has large positive A 2 values, (1.3-1.4) × 10-4 mol g-2 cm3. It is successfully explained by the simulation results considering intermolecular topological interaction. © 2013 American Chemical Society.

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/ma400774r.

81840

Solution properties of a cyclic chain having tunable chain stiffness: Cyclic amylose tris(n-butylcarbamate) in theta and good solvents

American Chemical Society

英語

2013-07-21

Macromolecules

46

13

5355

5362

https://doi.org/10.1021/ma400774r

https://hdl.handle.net/11094/81840