| 分子结构对LLDPE动态流变行为的影响 |
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| 引用本文： | 翟元明,杨伟,王宇,谢邦互,杨鸣波.分子结构对LLDPE动态流变行为的影响[J].高分子材料科学与工程,2010(1):88-91. |
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| 作者姓名： | 翟元明 杨伟 王宇 谢邦互 杨鸣波 |
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| 作者单位： | 四川大学高分子科学与工程学院高分子材料工程国家重点实验室; |
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| 基金项目： | 国家自然科学基金资助项目(20734005,10590351) |
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| 摘 要： | 通过动态流变行为测试,研究了一系列丁烯共聚和己烯共聚LLDPE的储能模量、损耗模量、零切黏度和动态黏度的变化规律,并讨论了它们与分子结构的关系。研究表明:(1)两个系列的LLDPE样品所得到的动态交点G_x随着重均相对分子质量的增大,其对应的频率越低;(2)两个系列的复数黏度和重均相对分子质量的关系式不符合Raju的经验方程;(3)一定含量的长支链可以加剧剪切变稀的程度,而动态黏度在聚合物重均相对分子质量相差不大的情况下,随着分子量分布的增大而增大。
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| 关 键 词： | 线性低密度聚乙烯 分子结构 动态流变行为 |
Effects of Molecular Structures of LLDPE on the Dynamic Rheological Behaviors |
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| ZHAI Yuan-ming,YANG Wei,WANG Yu,XIE Bang-hu,YANG Ming-bo.Effects of Molecular Structures of LLDPE on the Dynamic Rheological Behaviors[J].Polymer Materials Science & Engineering,2010(1):88-91. |
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| Authors: | ZHAI Yuan-ming YANG Wei WANG Yu XIE Bang-hu YANG Ming-bo |
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| Affiliation: | College of Polymer Science and Engineering;State Key Laboratory of Polymer Materials Engineering;Sichuan University;Chengdu 610065;China |
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| Abstract: | The changes of storage modulus(G’),loss modulus(G"),zero shear viscosity and dynamic viscosity were studied by investigating the dynamic rheological behaviors of a series of butene and hexane copolymerized LLDPE with various molecular structures.The results indicate that:(1) the dynamic cross-point G_x correspond to the low frequencyωas the M_w increasing;(2) the dependence of the complex viscosity on the weight average molecular weight does’t follow the Raju equation and(3) the long chain branching enhances the shear-thinning behavior and the dynamic viscosity depends chiefly on the polydispersity as the weight average molecular weight are similar. |
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| Keywords: | linear low density polyethylene molecular structures dynamic rheological behaviors |
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