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Temperature dependence of polymer network diffusion
HOME . Press Releases . Press Releases . 2021.11.30 Temperature dependence of polymer network diffusion . Authors Takeshi Fujiyabu, Takamasa Sakai, Ryota Kudo, Yuki Yoshikawa, Takuya Katashima, Ung-il Chung, and Naoyuki Sakumichi 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 g e l ?and the increase therein as the gelation proceeds? Δ D ≡ D ? D g e l ?indicates that? Δ 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’’ [Phys. Rev.?X 11, 011045 (2021)], demonstrating a nontrivial similarity between the statics and dynamics of polymer networks. Physical Review Letters : https://journals.aps.org/prl/accepted/1e07bY75S661258cf6495802dd3daac1c85b89a84 .
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