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首页> 外文期刊>Journal of Applied Polymer Science >Structure Development in Oriented Polyethylene Films and Microporous Membranes as Monitored by Sound Propagation
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Structure Development in Oriented Polyethylene Films and Microporous Membranes as Monitored by Sound Propagation

机译：声传播监测的定向聚乙烯薄膜和微孔膜的结构发展

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Microporous membranes of high-density polyethylene were prepared by melt-extrusion followed by annealing and uniaxial extension. Crystallization at a high melt flow rate and subsequent annealing of the spun films with fixed ends led to the formation of oriented hard-elastic materials with a high modulus of elasticity and a considerable work recovery. Uniaxial stretching of such systems along the orientation direction induced the formation of microscopic pores due to the specific structure of the hard-elastic material. At some critical values of the processing parameters, through-flow channels were formed, converting the film into a microporous membrane permeable to liquids and vapors. Sound propagation, tensile measurements, and X-ray diffraction techniques were used to characterize the structure and properties of the samples at individual stages of the process as a function of the processing parameters. In particular, it was shown that polar diagrams of the sound propagation velocity reflect sensitively the structural changes in the process of porous structure formation.
机译：高密度聚乙烯的微孔膜是通过熔融挤出，然后退火和单轴延伸制备的。具有高熔体流动速率的结晶和具有固定端的纺丝薄膜随后的退火导致形成具有高弹性模量和可观的功恢复率的定向硬弹性材料。由于硬弹性材料的特定结构，沿取向方向的这种系统的单轴拉伸引起微观孔的形成。在加工参数的某些临界值下，形成了通流通道，将薄膜转化为可透过液体和蒸气的微孔膜。声音传播，拉伸测量和X射线衍射技术被用来表征样品在工艺的各个阶段的结构和特性，这些参数是工艺参数的函数。特别地，表明了声传播速度的极坐标图敏感地反映了多孔结构形成过程中的结构变化。

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