| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 96 === With the advance of the micro/nanotechnology, the polymer products with micro-structure in MEMS system are getting more and more important. Changing the superstructure of the polymer products is an effective method for improving the function of micro-structure. Applying external energy field is one of the methods that can change the superstructure of the polymer products effectively.
In this study, electric field is an external energy field for injection molding. The isolated electrodes are inserted into the mold for injection molding which has micron-scale structures and they apply electric field when injection molding. In the experiment of injection molding using PVDF/PP blends, the applying of electric field decreases the flow behavior of immiscible PVDF phase at low mold temperature and makes the immiscible PVDF phase which aligned along the direction of the injection only in the shear layer also appears in the core layer. However, when the mold temperature raises to 150℃, the superstructure of the products shows uniform crystal morphology. So the electric field cannot keep the alignment of immiscible PVDF blend at this mold temperature.
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