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首页> 外文期刊>Journal of Applied Polymer Science >In situ visualization of drop deformation, erosion, and breakup in high viscosity ratio polymeric systems under high shearing stress conditions
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In situ visualization of drop deformation, erosion, and breakup in high viscosity ratio polymeric systems under high shearing stress conditions

机译：高剪切应力条件下高粘度比聚合物体系中液滴变形，侵蚀和破裂的原位可视化

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In this paper, deformation and breakup under simple shear of single molten polymer drops in a polymer matrix were investigated. Flow visualization was carried out in a Couette-Flow apparatus under relatively high shear rates and temperatures up to 230 degrees C. Drop/Matrix combinations were composed of polystyrene drops of 0.5-0.6 mm in diameter in polyethylene matrix, and ethylene-propylene copolymer drops of approximately the same size in polypropylene matrix. The deformation and breakup processes were studied under steady state and time-dependent shearing conditions. Either for steady state or time-dependant shearing conditions, drop elasticity generated at relatively high shear rates helped the drops to align perpendicular to the flow direction, i.e., parallel to vorticity axis. Also, the most striking non-Newtonian effects for the high viscosity ratio systems were the Surface erosion and the drop splitting mechanisms. The particles eroded off the main droplet surface were very fine, in the range of 10-50 mu m, and led to a significant reduction in main drop size before its final breakup. (c) 2006 Wiley Periodicals, Inc.
机译：本文研究了在聚合物基质中单个熔融聚合物液滴在简单剪切作用下的变形和破裂。在较高的剪切速率和最高230摄氏度的温度下，在Couette-Flow设备中进行流动可视化。液滴/基质组合由聚乙烯基质中直径为0.5-0.6 mm的聚苯乙烯液滴和乙烯-丙烯共聚物液滴组成在聚丙烯基质中的尺寸大致相同。研究了在稳态和随时间变化的剪切条件下的变形和破裂过程。对于稳态或随时间变化的剪切条件，以相对较高的剪切速率产生的墨滴弹性帮助墨滴垂直于流动方向，即平行于涡度轴排列。同样，高粘度比体系最引人注目的非牛顿效应是表面腐蚀和液滴分裂机理。从主液滴表面侵蚀的颗粒非常细，在10至50微米的范围内，并导致主液滴尺寸在其最终破碎之前显着减小。 （c）2006年Wiley Periodicals，Inc.

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