Flow-induced whisker orientation and viscosity for molten composite systems in a uniaxial elongational flow field
Flow-induced whisker orientation and viscosity for molten composite systems in a uniaxial elongational flow field
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DOI：
10.1016/0032-3861(95)99787-u
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发表时间：
1995
期刊：
影响因子：
4.6
通讯作者：
Masatoshi Kobayashi;T. Takahashi;J. Takimoto;K. Koyama
中科院分区：
文献类型：
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作者：
Masatoshi Kobayashi;T. Takahashi;J. Takimoto;K. Koyama
用迈斯纳型单轴拉伸流变仪测定了聚苯乙烯-钛酸钾晶须复合材料熔体的拉伸粘度。为了研究晶须取向对复合材料熔体拉伸粘度的影响，采用广角X射线衍射方法，以晶须取向相对于流动方向的平均极角为变量，分析了单轴拉伸流场中晶须取向随时间的变化规律。晶须阻止了聚苯乙烯在拉伸流动中的应变硬化现象。拉伸粘度几乎与晶须的取向变化无关。晶须的取向仅取决于应变。为了理解这一现象，晶须取向进行了讨论，与杰弗里理论的比较。在单轴拉伸流场中，平均极角的变化趋势与Jeffery理论的变化趋势相似。
The elongational viscosity of polystyrenepotassium titanate whisker composite melt was estimated by using a Meissner-type uniaxial elongational rheometer. The time dependence of flow-induced whisker orientation in a uniaxial elongational flow field was analysed in terms of the average polar angle with respect to the flow direction by wide-angle X-ray diffraction, in order to study the influence of whisker orientation on the elongational viscosity of composite melts. The whiskers prevented the strain-hardening phenomenon in elongational flow for polystyrene. The elongational viscosity was almost independent of the orientational change of the whiskers. The orientation of the whiskers was dependent on strain only. To understand this phenomenon, whisker orientation was discussed in comparison with Jeffery theory. The tendencies of the average polar angle were similar to the tendency of Jeffery theory in a uniaxial elongational flow field.