| 振动剪切作用下LDPE和HDPE熔体的非仿射网络结构模型 |
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| 引用本文： | 张娟,瞿金平.振动剪切作用下LDPE和HDPE熔体的非仿射网络结构模型[J].上海大学学报(英文版),2002,6(4):292-296. |
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| 作者姓名： | 张娟 瞿金平 |
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| 作者单位： | PolymerProcessingEquipmentNationalEngineeringandResearchCenter,DepartmentofIndustrialEquipmentandControlEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,China |
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| 摘 要： | We propose molten polymer‘s entanglement network deformation to be nonaffine and use transient network structural theory with the revised Liu‘s kinetics rate equation and the revised upper convected Maxwell constitutive equation to establish a nonaffine network Structural constitutive model for studying the rheological behavior of molten Low-Density Polyethylene(LDPE)and High Density Polyethylene(HDPE)in oscillatory shear.As a result,when the strain amplitude or frequency increases,the shear stress amplitude increases.At the same time,the accuracy of the nonaffine network model is higher than that of affine network model.It is clear that there is a small amount of nonaffine network deformation for LDPE melts which have long-chain branches,and there is a larger amount of nonaffine network deformation in oscillatory shear for HDPE melts which has no long-chain branches.So we had better consider the network deformation nonaffine when we establish the constitutive equations of polymer melts in oscillatory shear.
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| 关 键 词： | 低密度聚乙烯 高密度聚乙烯 剪切振动作用 非仿射网络结构模型 动力学方程 |
| 收稿时间： | 20 March 2002 |
Nonaffine network structural model for molten Low-Density polyethylene and High-Density Polyethylene in oscillatory shear |
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| Juan Zhang Ph. D. Candidate,Jin-Ping Qu Ph. D..Nonaffine network structural model for molten Low-Density polyethylene and High-Density Polyethylene in oscillatory shear[J].Journal of Shanghai University(English Edition),2002,6(4):292-296. |
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| Authors: | Juan Zhang Ph D Candidate Jin-Ping Qu Ph D |
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| Institution: | Polymer Processing Equipment National Engineering and Research Center, Department of Indust rial Equipment and Control Engineering, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | We propose molten polymer's entanglement network deformation to be nonaffine and use transient network structural theory with the revised Liu's kinetics rate equation and the revised upper convected Maxwell constitutive equation to establish a nonaffine network structural constitutive model for studying the rheological behavior of molten Low Density Polyethylene (LDPE) and High Density Polyethylene (HDPE) in oscillatory shear. As a result, when the strain amplitude or frequency increases, the shear stress amplitude increases. At the same time, the accuracy of the nonaffine network model is higher than that of affine network model. It is clear that there is a small amount of nonaffine network deformation for LDPE melts which have long chain branches, and there is a larger amount of nonaffine network deformation in oscillatory shear for HDPE melts which has no long chain branches. So we had better consider the network deformation nonaffine when we establish the constitutive equations of polymer melts in oscillatory shear. |
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| Keywords: | kinetics rate equation nonaffine network structural model nonaffine deformation oscillatory shear |
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