摘要
在大振幅剪切振动下的 Ca CO3/ PP熔体中 ,存在填充粒子贯穿基体形成的复合网络、填料粒子团聚体和纯基体微流区 3种相畴 ,假定它们的力学行为分别可以用 Kelvin微元和塑性屈服元及 Maxwell微元描述 ,则可以建立唯象本构模型 ,文中用它解释了 Yeh和 Jyun的实验结果 ,填充比增大 ,屈服应力增加 ;表面处理改善了两相的相容性 ,团聚体更易破碎 ,屈服应力减小 ,应力波出现“平顶”
In CaCO 3 filled PP melt, three kinds of micro domains exist: the bulk matrix impenetrated by particle, agglomerate of particles and the micro flow of PP matrix among flocs of particles. It is assumed that they can be described by Kelvin element, its confining plastic yield unit as well as Maxwell element respectively. Thus a phenomenological constitutive model is developed to describe large amplitude oscillatory shear (LAOS) of composite melts. The model well predicts Yeh and Jyun′s experimental results of CaCO 3 filled PP. For high filled melt, yield indeed leads to the strong non linearity and stress wave peak flattening when the exerted stress is beyond dynamic yield stress. The surface treatment enhances the compatibility between two phases, which eases the viscous flow.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2001年第6期40-43,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目 (2 96 340 43- 2 )
