Damping of acoustic waves in dilute polymer solutions
Damping of acoustic waves in dilute polymer solutions
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DOI：
10.1021/ma048486h
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发表时间：
2004-07
期刊：
影响因子：
5.5
通讯作者：
Y. Tsori;P. Gennes
中科院分区：
文献类型：
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作者：
Y. Tsori;P. Gennes
本文用Zimm模式测量和解释了聚合物稀溶液（挠性线圈）的剪切粘度η_s（w）。指出纵向粘度η_l（w）是两个分量之和η_l=4* η_s/3+ η_p，其中η_p是由于压力对线圈尺寸的影响。我们讨论了一个包含Kuhn长度a和Flory参数chi依赖于压力的粗糙模型的eta_p。我们发现，在良好的溶剂条件下，eta_p与eta_s相当，但在θ点附近，eta_p应优于eta_s。
The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity eta_l(w) is the sum of two components eta_l=4*eta_s/3+eta_p, where eta_p is due to an effect of pressure on the coil size. We discuss eta_p for a crude model involving a dependence of both the Kuhn length a and the Flory parameter chi on pressure. We find that eta_p is comparable to eta_s for good solvent conditions, but that eta_p should dominate over eta_s near the theta point.