【作者】 陈宏亮；

【导师】 毛立新；

【作者基本信息】 北京化工大学 ， 材料加工工程， 2008， 硕士

【摘要】 本论文借助Haake转矩流变仪、DSC、高级流变扩展系统ARES等现代化测试手段,对mPE/LDPE、PP/POE共混体系的剪切和拉伸流变性能进行了系统研究。通过对mPE/LDPE共混体系的流变性能研究,发现在mPE基体中混入少量的LDPE,不仅可以明显降低mPE熔体的剪切粘度,提高其熔体剪切粘度对频率和温度的敏感性,而且使mPE/LDPE共混体系拉伸流变性能得到显著改善,熔体强度得到明显提高,进而改善了mPE的加工性能。通过对PP/POE共混体系的流变性能研究,发现PP结构、POE含量均对共混体系流变性能有显著影响。PP/POE共混体系的剪切流变数据显示,PP和POE界面存在明显界面滑移现象,且这种滑移现象受PP和POE相容性的影响较大,其中PP1与POE之间界面滑移现象比PP2与POE之间界面滑移现象要更加明显。另外,拉伸流变试验数据显示,对于PP1/POE共混体系,当POE含量达到30%时,共混体系的拉伸粘度发生突变;对于PP2/POE共混体系,当POE含量达到10%时,共混体系的粘度曲线即发生明显变化。动态剪切流变试验数据显示,与PP2/POE共混体系相比,PP1/POE共混体系的线性粘弹区域较宽,其线性粘弹特征亦更明显。上述实验结果的取得,对于进一步研究茂金属聚乙烯共混体系的流变性能—相态结构—力学性能的关系提供了重要的基础数据和理论指导,对茂金属聚乙烯及其共混体系加工与应用的发展具有一定的理论与实际意义。更多还原

【Abstract】 The shear and extensional rheological properties of mPE/LDPE and PP/POE blend systems were systematically studied by means of a series of modern analysis technologies such as Haake rheometer, DSC, ARES rheometer.Based on the study on rheological properties of mPE/LDPE blend systems, it was found that not only the shear viscosity decreased, but also the dependence of its shear viscosity on shear rate and temperature increased, and its extensional rheology and processibility were improved obviously after blending some LDPE with mPE.By study on rheological properties of PP/POE blend systems, it was found that the structure of PP and content of POE had significant effect on rheological properties of blend systems. Shear rheological data of PP/POE showed that interfacial slip existed between PP and POE, which was greatly influenced by the compatibility of PP and POE, and interfacial slip between PP1and POE was more obvious than PP2 and POE. In addition, extensional rheological data indicated that extensional viscosity of PPl/POE blend systems changed greatly when content of POE amounted to 30%, while extensional viscosity curves of PP2/POE changed obviously when content of POE is only more than 10%. Data of dynamic shear rheometric tests displayed that not only linear viscoelasticity zone of PPl/POE blend systems was wider than PP2/POE, but also linear viscoelasticity phenomena was more obvious.All the above experimental results and conclusions obtained would provide important basic data and theoretical guidance for further study on rheological properties, phase morphology and mechanical properties of metallocene polyethylene blend system, and have theoretical and practical significance for development and application of it.更多还原