双峰中密度聚乙烯/纳米碳酸钙复合材料的流变行为与力学性能  

Rheological Behavior and Mechanical Properties of Melt of Bimodal Medium Density Polyethylene/Nano-CaCO_3 Composite material

作　　者：于茂赏[1] 高俊刚[2] 史大刚[2] 

机构地区：[1]常熟高等专科学校化学系,江苏常熟215500 [2]河北大学化学与环境科学学院,河北保定071002

出　　处：《常熟高专学报》2004年第2期29-33,共5页Journal of Changshu College

基　　金：河北省自然科学基金(批准号:201068);河北省教育厅科研基金(批准号:2000105)资助项目.

摘　　要：研究了双峰中密度聚乙烯(BMDPE)与纳米碳酸钙不同配比复合物的流变行为与力学性能。讨论了复合物的组成、剪切应力和剪切速率以及温度对熔体粘度和膨胀比的影响,测定了不同配比熔体的非牛顿指数(n)、熔体流动速率(MFR)、粘流活化能以及习用屈服应力,断裂应力和断裂伸长率,用扫描电镜观察了纳米碳酸钙在复合材料中的分散情况。结果发现:纳米碳酸钙可以均匀地分散在BMDPE中,少量的纳米碳酸钙就可以明显提高材料的力学性能,在较高的剪切速率下还可以改善材料的加工性能。Melts rheological behavior and Mechanical Properties of bimodal medium density polyethylene (BMDPE)/Nano-CaCO_3 composite material is studied.Influences of shear ratio,shear stress and different temperatures on swell ratio and melt apparent viscosity are discussed.Non-Newtonian index (n),melting flow rate (MFR),conventional yield stress,breaking stress and breaking extensibility of the composite material with different composition are measured.Distributed scatters in BMDPE / nano-CaCO_3 composite material is observed by SEM.Not only mechanical properties of BMDPE / Nano-CaCO_3 composite material is apparently improved,but also its processability can be mended in high shear ratio by nano-CaCO_3.

关 键 词：双峰中密度聚乙烯 纳米碳酸钙 复合材料 流变性 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]