The rheology of the rheotens test
The rheology of the rheotens test
复制标题
DOI：
10.1122/1.550907
复制
发表时间：
1998-06
影响因子：
3.3
通讯作者：
M. Wagner;A. Bernnat;V. Schulze
中科院分区：
文献类型：
--
作者：
M. Wagner;A. Bernnat;V. Schulze
等温熔融纺丝是许多聚合物工艺的典型示例：聚合物熔体首先在挤出模头中经受简单的剪切流动，然后在纺丝线中在恒定力下进行单轴拉伸。在Rheotens测试中，测量拉伸挤出长丝所需的拉伸力作为拉伸比的函数。以这种方式，在一次测试运行期间探测一整套熔融纺丝条件。Rheotens主曲线的存在简化了对这一复杂变形历史的分析。这些允许在纤维纺丝过程中的材料行为的直接和简单的描述，和在恒定牵伸力的作用下的表观拉伸粘度的简化测定。
Isothermal melt spinning is a prototypical example of many polymer processes: The polymer melt is first subjected to simple shear flow in the extrusion die, which is followed by uniaxial extension under constant force in the spinline. In a Rheotens test, the tensile force needed for elongation of an extruded filament is measured as a function of the draw ratio. In this way, a whole set of melt spinning conditions is probed during one test run. The analysis of this complicated deformation history is simplified by the existence of Rheotens grandmastercurves. These allow a direct and straightforward description of material behavior in the fiber spinning process, and a simplified determination of an apparent elongational viscosity under the action of a constant drawdown force.