Shear Modulus Dependence of the Diffusion Coefficient of the Polymer Network
Shear Modulus Dependence of the Diffusion Coefficient of the Polymer Network
复制标题
聚合物网络扩散系数的剪切模量依赖性
DOI：
10.1021/acs.macromol.9b01654
复制
发表时间：
2019
期刊：
影响因子：
5.5
通讯作者：
and Takamasa Sakai
中科院分区：
文献类型：
--
作者：
Takeshi Fujiyabu;Yuki Yoshikawa;Junhyuk Kim;Naoyuki Sakumichi;Ung-il Chung;and Takamasa Sakai
聚合物凝胶网络的动力学由Tanaka，Hocker和Benedek（THB）提出的理论描述，该理论给出了聚合物网络的扩散系数。这里，K是渗透体积模量，G是剪切模量，f是聚合物网络和溶剂之间的摩擦系数。虽然一些实验研究调查了聚合物凝胶网络的动力学，THB理论尚未得到定量验证。在本研究中，我们通过比较动态光散射和动态粘弹性测量测量的四聚乙二醇凝胶的D和G定量验证THB理论。THB理论很好地描述了D随G的增加而线性增加的规律，并从斜率和截距给出了K和。标度律很好地解释了Kandf对凝胶网络结构参数的依赖性。这些结果表明THB理论几乎是有效的。
Dynamics of a polymer gel network is described by the theory proposed by Tanaka, Hocker, and Benedek (THB) that gives the diffusion coefficient of a polymer network. Here,Kis the osmotic bulk modulus,Gis the shear modulus, andfis the friction coefficient between the polymer network and the solvent. Although several experimental studies investigated the dynamics of a polymer gel network, the THB theory has yet to be quantitatively validated. In this study, we quantitatively validate the THB theory by comparingDandGof Tetra-poly(ethylene glycol) gels measured by dynamic light scattering and dynamic viscoelastic measurement. The THB theory well described the linear increase inDwith increasingGand gaveKandffrom the slope and the intercept. The gel network structural parameter dependences of the givenKandfwere well explained by the scaling laws. These results suggest that the THB theory is almost valid.