学術雑誌論文

学術雑誌論文

text

Polymer Journal. 2014, 46(3), p. 155-159

Solution SAXS measurements over a wide temperature range to determine the unperturbed chain dimensions of polystyrene and a cyclic amylose derivative

Nature Publishing Group

英語

text

2014

https://doi.org/10.1038/pj.2013.76

http://www.nature.com/pj/journal/v46/n3/abs/pj201376a.html#aff1

The mean-square radii of gyration <S^2> of two polystyrene (PS) samples with weight-average molar masses Mw of 2.18 × 10^4 and 3.88 × 10^4 in toluene and 2-butanone and of a cyclic amylose tris(phenylcarbamate) (cATPC) with a Mw of 4.73 × 10^4 in tetrahydrofuran were determined by synchrotron radiation small-angle X-ray scattering measurements over a wide range of temperatures from −77 °C to 70 °C. Both PS and cATPC are sufficiently soluble to enable SAXS measurements even at −77 °C in the solvents used. The <S^2> of cATPC does not depend on temperature over the range investigated here. This result may be reasonable for such rigid ring polymers. In contrast, the radii of PS depend on temperature to a significant degree, whereas the second virial coefficient is mostly temperature independent. The resulting characteristic ratio C_∞ for PS in toluene decreases monotonically with increasing temperature, as predicted both by the rotational isomeric state (RIS) and by (helical) wormlike chain models. However, C_∞ in 2-butanone exhibits a minimum ~10 °C and increases with increasing temperature, suggesting that the RIS energy parameters should be affected by the intermolecular interactions between the polymer and solvent.

51733

Solution SAXS measurements over a wide temperature range to determine the unperturbed chain dimensions of polystyrene and a cyclic amylose derivative

Nature Publishing Group

英語

2014

Polymer Journal

46

3

155

159

https://doi.org/10.1038/pj.2013.76

https://hdl.handle.net/11094/51733

http://www.nature.com/pj/journal/v46/n3/abs/pj201376a.html#aff1