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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Zone Drawing on the Structure of Metallocene Polyethlene
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Effects of Zone Drawing on the Structure of Metallocene Polyethlene

机译：区域拉伸对茂金属聚乙烯结构的影响

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摘要

The influence of zone drawing on bulk properties and structure of metalloxene polyethylene (m-PE) is reported. Two different m-PE materials were subjected to tensile stresses above the yield point by zone drawing in the temperature range from 50 to 100 deg C. Drawn materials were characterized by using small- and wide-angle X-ray scattering (SAXS, WAXS), molecular retraction, and small-angle light scattering (SALS). Structural changes were studied as a function of drawing temperature, engineering strees, and draw ratio. WAXS showed strong crystalline orientation in drawn samples, and only the orthorhombic crystal modification was observed. SAXS showed lamellar orientation in drawn samples. At low drawing temperatures of 50 or 60 deg C, draw ratio increased as a step function of stress. There is a stress barrier, which must be exceeded before high-draw rations can be achieved at these temperatures. At drawing temperatures of 70 deg C or above, the barrier stress is low enough that draw ratio increases nearly linearly as a function of stress is low enough that draw ratio increases nearly linearly as a function of stress. Below the stress barrier, spherulitic structure is observed by small-angle light scattering (SALS). Elongation occurs via deformation of the interspherulitic amorphous phase. Molecular retraction was low for these samples, indicating mostly plastic deformation of the amorphous material. Above. the stress barrier, SALS showed that spherulites are destroyed. Elongation occurs via deformation of the intraspherulitic amorphous phase. Molecular retraction for these samples was high, indicating elastic deformation of the amorphous material.
机译：报道了区域拉伸对茂金属聚乙烯（m-PE）的本体性能和结构的影响。两种不同的m-PE材料在50至100℃的温度范围内通过区域拉伸经受高于屈服点的拉伸应力。通过使用小角度和广角X射线散射（SAXS，WAXS）对拉伸材料进行表征，分子收缩和小角度光散射（SALS）。研究了结构变化与拉伸温度，工程应力和拉伸比的关系。 WAXS在拉伸的样品中显示出很强的晶体取向，并且仅观察到正交晶体的修饰。 SAXS在抽取的样品中显示出层状取向。在50或60摄氏度的低拉伸温度下，拉伸比随应力的阶跃函数增加。有一个应力屏障，在这些温度下可以实现高拉伸比之前，必须超过该应力屏障。在拉伸温度为70摄氏度或更高的情况下，势垒应力足够低，使得拉伸比随应力的变化几乎呈线性增加。在应力屏障下方，通过小角度光散射（SALS）观察到球状结构。伸长通过球间非晶相的变形而发生。这些样品的分子回缩率低，这主要表明非晶态材料发生塑性变形。以上。在应力屏障中，SALS表明球晶被破坏了。伸长是通过球内非晶相的变形而发生的。这些样品的分子回缩很高，表明无定形材料的弹性变形。

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