Evolution of polymer blend morphologies during extrusion in a flat die
نویسندگان
چکیده
The control of blend morphologies during process is of prime importance in order to predict the final properties of polymer blends. A coextrusion technique combined with static mixers was developed in order to smartly blend polymeric melts and to optimize the blend morphologies during the flow in static mixers [1]. The aim of this paper is to study the evolution of those blend morphologies during extrusion in a flat die. The effect of the viscosity ratio and the interfacial tension are also investigated. The experimental observations are confronted with numerical simulation results.
منابع مشابه
Optimization of Axisymmetric Extrusion Die Profiles
In this research, optimization process of axisymmetric extrusion dies is proposed. Plastic zone is analyzed using finite element method in the Eulerian system with flow formulation. The die profiles are defined by Bezier curves with six control points. Two effective functions are considered in this research; standard deviation of the strain rate and the rate of energy consumption during extrusi...
متن کاملOrientation effect in the crystallization of polymer blend during extrusion
The processing during extrusion can be done either in the steady or transient state. In the first case, all components are added continuously in the extruder and the machine produces great quantities of mixed compound. In the transient state, the polymer that will form the matrix is fed continuously in the extruder and all other components are added as a single or multiple pulse. The mixed mate...
متن کاملNumerical investigation of strain distribution during cyclic expansion extrusion (CEE)
Strain distribution of Al 1100 was numerically investigated during cyclic expansion extrusion (CEE) process using finite element method (FEM). Die angle, corner fillet radius and die chamber diameter were considered as die parameters and friction factor and number of passes as process parameters. The effects of these parameters were investigated on the effective strain and strain homogeneity in...
متن کاملFoaming PLA with Thermoplastic Starch by Extrusion Assisted by Supercritical CO 2
The manufacture of biopolymers foams with poly-lactic acid (PLA) and thermoplastic starch (TPS) using the green process of extrusion assisted by supercritical CO2 is a promising way towards new applications. A parametric study evidenced that the porosity is strongly correlated with the die temperature, CO2 content and TPS load. To get a high porosity, die temperature has to be diminished to blo...
متن کاملElongated phase separation domains in spin-cast polymer blend thin films characterized using a panoramic image.
Polymer thin films with micro/nano-structures can be prepared by a solvent evaporation induced phase separation process via spin-casting a polymer blend, where the elongated phase separation domains are always inevitable. The striation defect, as a thickness nonunifomity in spin-cast films, is generally coexistent with the elongated domains. Herein, the morphologies of polymer blend thin films ...
متن کامل