Snijkers F, Pasquino R, Olmsted P D, Vlassopoulos D
FORTH, Institute of Electronic Structure and Laser, Heraklion, Crete 71110, Greece. CNRS/Solvay UMR 5268, Laboratoire Polymères et Matériaux Avancés, Saint-Fons 69190, France.
J Phys Condens Matter. 2015 Dec 2;27(47):473002. doi: 10.1088/0953-8984/27/47/473002. Epub 2015 Nov 12.
We briefly review the recent advances in the rheology of entangled polymers and identify emerging research trends and outstanding challenges, especially with respect to branched polymers. Emphasis is placed on the role of well-characterized model systems, as well as the synergy of synthesis-characterization, rheometry and modeling/simulations. The theoretical framework for understanding the observed linear and nonlinear rheological phenomena is the tube model, which is critically assessed in view of its successes and shortcomings, and alternative approaches are briefly discussed. Finally, intriguing experimental findings and controversial issues that merit consistent explanation, such as shear banding instabilities, multiple stress overshoots in transient simple shear and enhanced steady-state elongational viscosity in polymer solutions, are discussed, and future directions such as branch point dynamics and anisotropic monomeric friction are outlined.
我们简要回顾了缠结聚合物流变学的最新进展，确定了新出现的研究趋势和突出挑战，特别是关于支化聚合物的方面。重点在于特征明确的模型体系的作用，以及合成-表征、流变测量和建模/模拟的协同作用。理解所观察到的线性和非线性流变现象的理论框架是管模型，鉴于其优缺点对其进行了批判性评估，并简要讨论了替代方法。最后，讨论了值得一致解释的有趣实验结果和有争议的问题，如剪切带不稳定性、瞬态简单剪切中的多重应力过冲以及聚合物溶液中增强的稳态拉伸粘度，并概述了未来的方向，如分支点动力学和各向异性单体摩擦。
