Study On The Rheological Behavior Of Metal Powder Filled Polymer System

There are many advantages and applications of metal powder filled polymer system which can not be obtained using metal or polymer only. However, properly designed formulation is necessary, for reological properties of filled polymer are various when volume fraction and formulation design are changed, which will lead to the change of mechanical and processing properties of filled polymer. In order to assure that filled polymer are easy to process, the study on rheological behavior of metal powder filled polymer system is valuable.According to the measurement and characterization of viscoelastic behaviors of polymer melt under the vibration force field project supported by the National Natural Science Foundation of China, and the study on precision viscous forming technology of metal powder project supported by China Postdoctoral Science Foundation, based on the summarization of a number of equations describing rheological behavior of filled polymer, Heitmiller equation which describes the rheological behaviors relationship between matrix and matrix constitute and Maron-Pierce equation which describes effect of powder volume fraction on the filled polymer rheological behaviors were corrected, and made accord with practice better. The effect of shear rate on filled polymer rheological behavior was linked with the effect of temperature and powder loading fraction together respectively. A system method was devised to forecast the viscosity of the filled polymer in a number of different conditions only through several groups of rheology tests.Numerous tests were done in the Rosand RH7D double dies capillary rheolometer to evaluate the rheology equations. Through the experiments, the special values of the parameter and the concrete form of the function presented in the theory mold were obtained and good examples were made to show how the various rheology equations should be used as a system.Some matrix system contains plenty of low molecular, so rheology equations normally can not be used directly in this situation. Solutions of this special case were reported. The real-time extrusion swell data gatering system were used to study the extrusion swell, and the relationship between extrusion swell and the influence factors such as temperature, shear rate, powder loading fractions and the properties of the matrix was investigated.