ma0c01427_si_001.pdf (146.06 kB)
Mixing and Elastic Contributions to the Diffusion Coefficient of Polymer Networks
journal contribution
posted on 2020-08-28, 23:13 authored by Junhyuk Kim, Takeshi Fujiyabu, Naoyuki Sakumichi, Takuya Katashima, Yuki Yoshikawa, Ung-il Chung, Takamasa SakaiBecause
the swelling of polymer gels is a diffusion process of
the polymer network, the swelling rate is determined by the diffusion
coefficient of a polymer network. The diffusion coefficient (D) includes the polymer–solvent mixing contribution
(Dmix) and the elastic contribution from
the polymer network (Del). In this study,
we experimentally investigate D, Dmix, and Del, using tetra
gels whose network structural parameters are systematically controllable.
We measured D and the shear modulus (G) using dynamic light scattering and dynamic viscoelastic measurement,
respectively. According to the Tanaka–Fillmore theory, we evaluate Dmix and Del using
the linear relationship between D and G in the as-prepared state. Consequently, we demonstrate a relation
of D = Dmix + Del in the as-prepared, swelling, and equilibrium
swollen states.