1. Temperature Dependence of Polymer Network Diffusion
- Author
-
Fujiyabu, Takeshi, Sakai, Takamasa, Kudo, Ryota, Yoshikawa, Yuki, Katashima, Takuya, Chung, Ung-il, and Sakumichi, Naoyuki
- Subjects
Condensed Matter - Soft Condensed Matter ,Condensed Matter - Materials Science ,Condensed Matter - Statistical Mechanics ,Physics - Chemical Physics - Abstract
The swelling dynamics of polymer gels are characterized by the (collective) diffusion coefficient $D$ of the polymer network. Here, we measure the temperature dependence of $D$ of polymer gels with controlled homogeneous network structures using dynamic light scattering. An evaluation of the diffusion coefficient at the gelation point $D_{\mathrm{gel}}$ and the increase therein as the gelation proceeds $\Delta D\equiv D-D_{\mathrm{gel}}$ indicates that $\Delta D$ is a linear function of the absolute temperature with a significantly large negative constant term. This feature is formally identical to the recently discovered "negative energy elasticity" [Y. Yoshikawa et al., Phys. Rev. X 11, 011045 (2021) (arXiv:1912.13191)], demonstrating a nontrivial similarity between the statics and dynamics of polymer networks., Comment: 6+4 pages, 3+6 figures; published version
- Published
- 2021
- Full Text
- View/download PDF