Experimental studies of stress-diffusion coupling in semi-dilute polymer solutions. I. 'Viscoelastic length' and viscoelastic effects on early stage spinodal decomposition
Experimental studies of stress-diffusion coupling in semi-dilute polymer solutions. I. 'Viscoelastic length' and viscoelastic effects on early stage spinodal decomposition
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DOI：
10.1016/s0032-3861(01)00393-7
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发表时间：
2001-10-01
期刊：
影响因子：
4.6
通讯作者：
Hashimoto, T
中科院分区：
文献类型：
--
作者：
Toyoda, N;Takenaka, M;Hashimoto, T
本文研究了在应力和扩散耦合起重要作用的半稀聚合物溶液中粘弹性对早期旋量分解（SD）的影响。所谓的粘弹性长度，xi (ve)，在此范围内，应力抑制浓度波动的增长，定量评价了实验。结果表明，该数值约为聚合物旋转半径的10倍。我们测量了单相区域的互扩散系数、协同扩散系数、零剪切粘度和平台模量，并独立于SD实验评估了xi （ve）。在SD早期得到的xi （ve）值与扩散和粘弹性测量得到的值吻合较好，证实了Doi-Onuki理论的有效性。2001爱思唯尔科学有限公司版权所有。
We investigated the viscoelastic effects on the early stage spinodal decomposition (SD) in semi-dilute polymer solutions where the coupling between stress and diffusion plays an important role. The so-called viscoelastic length, xi (ve), within which the stress suppresses the growth of the concentration fluctuations, was quantitatively evaluated experimentally. The evaluated value was found out to be about 10 times larger than the radius of gyration of polymer. We measured the interdiffusion coefficient, the cooperative diffusion coefficient, the zero-shear viscosity, and the plateau modulus in the one phase region and evaluated xi (ve) independently from the SD experiment. The value xi (ve) obtained in the early stage SD agrees well with that estimated from the diffusion and viscoelasticity measurements, confirming the validity of the Doi-Onuki theory. (C) 2001 Elsevier Science Ltd. All rights reserved.