Temperature Dependence of Polymer Network Diffusion
Temperature Dependence of Polymer Network Diffusion
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DOI：
10.1103/physrevlett.127.237801
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发表时间：
2021-11-30
影响因子：
8.6
通讯作者：
Sakumichi, Naoyuki
中科院分区：
文献类型：
--
作者：
Fujiyabu, Takeshi;Sakai, Takamasa;Sakumichi, Naoyuki
聚合物凝胶的溶胀动力学由聚合物网络的（集体）扩散系数D表征。在这里，我们测量的温度依赖性D的聚合物凝胶与控制均匀的网络结构，使用动态光散射。在胶凝点处的扩散系数Dgel的评估以及随着胶凝进行而增加的AD等效于D-Dgel，表明AD是具有显著大的负常数项的绝对温度的线性函数。这个特征在形式上与最近发现的“负能量弹性”相同[Y。Yoshikawa等人，Phys.Rev.X11，011045（2021）]，证明了聚合物网络的静态和动态之间的非平凡相似性。
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 Dgel and the increase therein as the gelation proceeds AD equivalent to D - Dgel indicates that AD 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)], demonstrating a nontrivial similarity between the statics and dynamics of polymer networks.