| 用挤出物胀大等方法测量聚合物熔体的第一法向应力差 |
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| 引用本文： | 刘颖,陈栋荣,潘碧莲,苑会林.用挤出物胀大等方法测量聚合物熔体的第一法向应力差[J].北京化工大学学报(自然科学版),1991(1). |
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| 作者姓名： | 刘颖 陈栋荣 潘碧莲 苑会林 |
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| 作者单位： | 北京化工学院高分子系
(刘颖，陈栋荣，潘碧莲)，北京化工学院高分子系(苑会林) |
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| 摘 要： | 在挤出机上安装自行设计的毛细管口模,对PP,HDPE和PS熔体采用挤出物胀大法在较高剪切速率下测量第一法向应力差N_1,发现:由于N_1受胀大比B和剪切应力τ_W的双重影响,因此弹性测试比粘性测试所需的毛细管口模长径比要大;将挤出物胀大法与其他测量N_1的方法进行综合的分析比较,结果表明,挤出物胀大法所测N_1值比较合理,并可满足一般工程计算的要求。
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| 关 键 词： | 高聚物 熔体 流变性能 粘弹性 正应力 第一法向应力差 |
Determination of the First Normal Stress Difference of Polymer Melts |
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| Liu Ying T.W. Chan Pan Bilian Yuan Huilin.Determination of the First Normal Stress Difference of Polymer Melts[J].Journal of Beijing University of Chemical Technology,1991(1). |
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| Authors: | Liu Ying TW Chan Pan Bilian Yuan Huilin |
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| Institution: | Department of Polymer Science |
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| Abstract: | The method of extrudate swell is used to determine the first normal stress difference N_1 of polymer melts at high shear rates. It is found that a longer die than that used in viscosity measurements is required for the determination of N_1, since N_1 depends on both the swelling ratio and the shear stress. The N_1 results obtained from the method of extrudate swell are compared with the results obtained by other means. It is concluded that the N_1 results obtained from extrudate swell measurements are as good as anything else, and is certainly good enough for engineering purposes. |
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| Keywords: | polymer melts rheological property viscoelasticity normal stress first normal stress difference |
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