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首页> 外文期刊>Journal of Applied Polymer Science >Elastic behavior of LDPE/HEPE blend melts in capillary extrusion
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Elastic behavior of LDPE/HEPE blend melts in capillary extrusion

机译：LDPE / HEPE共混物在毛细管挤出中的弹性行为

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The studies of the elastic behavior in the capillary flow of LDPE/HDPE blend melts were carried out at a test temperature range from 180 to 200 degrees C and at an apparent shear rate of about 25-120 s(-1). The end-pressure drop (Delta P-end) increased nonlinearly with increasing wall shear stress (tau(omega)) and achieved a minimum value at a weight fraction (phi(HD)) of HDPE of 50%. The die-swell ratio (B) increased basically linearly with increasing tau(omega) or Delta P-end and achieved a maximum value at phi(HD) of 50%. With the addition of the die length-diameter ratio, the values of B were decreased linearly. At a low shear rate, the temperature sensitivity of the melt die-swell was more significant than at a high shear rate. With increasing phi(HD), B increased when phi(HD) <50%, then decreased. B reached a maximum value at phi(HD), of 50% and a fixed apparent shear rate. This phenomenon may be explained by using the theory of viscoelastic competition between components of polymer blend melts. Furthermore, the first normal stress difference (N-1) of the sample melts was estimated by using an equation published in a previous work. The results showed that B increased linearly with increasing N-1. (C) 2000 John Wiley & Sons, Inc. [References: 11]
机译：LDPE / HDPE共混熔体的毛细流动中的弹性行为的研究是在180至200摄氏度的测试温度范围内以及约25-120 s（-1）的表观剪切速率下进行的。端压降（Delta P-end）随着壁切应力（tau（ω））的增加而非线性增加，并且在HDPE的重量分数（phi（HD））为50％时达到最小值。模头膨胀率（B）随tau（ω）或Delta P端的增加而基本线性增加，并且在phi（HD）时达到最大值，为50％。随着模头长径比的增加，B值线性降低。在低剪切速率下，熔体冲模膨胀的温度敏感性比在高剪切速率下更显着。随着phi（HD）的增加，当phi（HD）<50％时B增加，然后降低。 B在phi（HD）达到最大值，为50％，表观剪切速率固定。可以通过使用聚合物共混物熔体组分之间的粘弹性竞争理论来解释这种现象。此外，通过使用先前工作中发表的公式估算了样品熔体的第一法向应力差（N-1）。结果表明，B随N-1的增加呈线性增加。 （C）2000 John Wiley＆Sons，Inc. [参考：11]

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