TY - JOUR
T1 - Mesoscopic Diffusion of Poly(ethylene oxide) in Pure and Mixed Solvents
AU - Zheng, Xiong
AU - Anisimov, Mikhail A.
AU - Sengers, Jan V.
AU - He, Maogang
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2018/4/5
Y1 - 2018/4/5
N2 - We present results from an experimental dynamic light-scattering study of poly(ethylene oxide) (PEO) in both a pure solvent (water) and a mixed solvent (tert-butanol + water). The concentration dependence of the diffusive relaxation of the PEO molecules is found to be typical of polymers in a good solvent. However, the mesoscopic diffusive behavior of PEO in the mixed solvent is very different, indicating an initial collapse and subsequent reswelling of PEO caused by co-nonsolvency. Furthermore, in the solutions of PEO with very large molecular weights, we found additional hydrodynamic modes indicating the presence of PEO clusters and aggregates similar to those found by some other investigators.
AB - We present results from an experimental dynamic light-scattering study of poly(ethylene oxide) (PEO) in both a pure solvent (water) and a mixed solvent (tert-butanol + water). The concentration dependence of the diffusive relaxation of the PEO molecules is found to be typical of polymers in a good solvent. However, the mesoscopic diffusive behavior of PEO in the mixed solvent is very different, indicating an initial collapse and subsequent reswelling of PEO caused by co-nonsolvency. Furthermore, in the solutions of PEO with very large molecular weights, we found additional hydrodynamic modes indicating the presence of PEO clusters and aggregates similar to those found by some other investigators.
UR - https://www.scopus.com/pages/publications/85045071904
U2 - 10.1021/acs.jpcb.7b10420
DO - 10.1021/acs.jpcb.7b10420
M3 - 文章
C2 - 29131952
AN - SCOPUS:85045071904
SN - 1520-6106
VL - 122
SP - 3454
EP - 3464
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 13
ER -