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【期刊论文】A new method to determine interfacial tension from the retraction of ellipsoidal drops
周持兴
,-0001,():
-1年11月30日
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周持兴
高分子材料科学与工程,1999,15(5):1~4,-0001,():
-1年11月30日
讨论了高聚物复杂流体的内部结构张量、热力学状态空间、自由能函数和非平衡热力学唯象定律,综述了唯 象定律在处于流场力作用下的高聚物熔体的大分子构象结构、两相共混物的相结构、纤维填充高聚物复合体系的 纤维取向结构的流变方程的应用,指出了一条建立流场中高聚物复杂结构流变方程的途径。
高聚物,, 复杂流体,, 内部结构,, 唯象定律,, 加工流场
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【期刊论文】A Rheological Model for Polymer Melts with Internal Structure in Flow Fields*
周持兴, ZHOU Chixing
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-1年11月30日
Conceptually, an imagined conformation ellipsoid is supposed to represent the shape of a polymer chain for polymer melts in flow fields and to be equivalent to the volume element in mathematical sense in continuum mechanics. A power law dependence of shear modulus of polymer melts on detC, referred to as envelope volume, is proposed. Based on those assumptions and the non-linear relation of shear modulus, a phenomenological viscoelastic model is derived. The model is tested in simple shear flow, simple elongational flow, oscillatory shear flow, and relaxation process after flow suddenly stopped. The results show that the model works well to predict the change of internal structure and viscoelastic performance of polymer melts in flow fields.
Polymer melts,, Rheological model,, Polymer conformation,, Flow fields
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周持兴, WEI YU, CHIXING ZHOU, TAKASHI INOUE
Journal of Polymer Science: Part B: Polymer Physics, Vol. 38, 2378-2389 (2000),-0001,():
-1年11月30日
A coalescence mechanism for the coarsening behavior of polymer blends during a quiescent annealing process is proposed. It suggests that the distribution state of dispersed particles in a matrix obeys a nearest-neighbor distribution function in multibody systems. Both drainage and merge stages are included in the coalescence. All existing forces, such as thermal agitation, van der Waals attraction, interfacial tension, and viscous resistance, take control of the coarsening process. A dynamic equation is used to compute the evolution of dispersed particles. An experimental investigation has been made with the time-resolved light scattering measurement of a polystyrene/ poly(methyl methacrylate) blend during an annealing process. The model predictions are in good agreement with our experiment and other authors' work. The relative effects of system parameters such as volume fraction, interfacial tension, and viscosity are also discussed.
polymer blends, coalescence, annealing, monodisperse
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