学術雑誌論文

学術雑誌論文

text

Journal of Physical Chemistry B. 2013, 117(32), p. 9576-9583

Local conformation and intermolecular interaction of rigid ring polymers are not always the same as the linear analogue: Cyclic amylose tris(phenylcarbamate) in θ solvents

American Chemical Society

英語

text

2013-07-23

https://doi.org/10.1021/jp406607w

Asano N., Kitamura S., Terao K.. Local conformation and intermolecular interaction of rigid ring polymers are not always the same as the linear analogue: Cyclic amylose tris(phenylcarbamate) in θ solvents. Journal of Physical Chemistry B, 117(32), 9576-9583, July 23, 2013. Copyright © 2013, American Chemical Society. https://doi.org/10.1021/jp406607w.

Small-angle X-ray scattering and static and dynamic light scattering measurements were made for cyclic amylose tris(phenylcarbamate) (cATPC) of which weight-average molar mass Mw ranges from 1.3 × 104 to 1.5 × 105 to determine their z-average mean square radius of gyration âŸ̈S2⟩z, particle scattering function P(q), hydrodynamic radius RH, and second virial coefficient A2 in methyl acetate (MEA), ethyl acetate (EA), and 4-methyl-2-pentanone (MIBK). The obtained âŸ̈S 2⟩z, P(q), and RH data were analyzed in terms of the wormlike ring to estimate the helix pitch per residue h and the Kuhn segment length λ-1 (the stiffness parameter, twice the persistence length). Both h and λ-1 for cATPC in MEA, EA, and MIBK are smaller than those for linear amylose tris(phenylcarbamate) (ATPC) in the corresponding solvent and the discrepancy becomes more significant with increasing the molar volume of the solvent. This indicates that not every rigid ring has the same local helical structure and chain stiffness as that for the linear polymer in the Mw range investigated while infinitely long ring chains should have the same local conformation. This conformational difference also affects A2. In actuality, negative A2 was observed for cATPC in MIBK at the θ temperature of linear ATPC whereas intermolecular topological interaction of ring polymers increases A2. © 2013 American Chemical Society.

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry B, © 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/jp406607w.

81830

Local conformation and intermolecular interaction of rigid ring polymers are not always the same as the linear analogue: Cyclic amylose tris(phenylcarbamate) in θ solvents

American Chemical Society

英語

2013-07-23

Journal of Physical Chemistry B

117

32

9576

9583

https://doi.org/10.1021/jp406607w

https://hdl.handle.net/11094/81830