電場對PVDF聚掺物微射出成形品之高次構造之影響

Abstract

隨著微/奈米技術的發展，高分子微結構成形品在微機電系統中的重要性越來越高，而改變高分子成形品的高次構造則是提升高分子微結構成形品性能的有力方法。其中額外加入能量場是影響高分子成形品高次構造的可能方法之一。 本研究以電場作為外加之能量場，在具有微米尺度微結構之射出成形模具的兩側加入絕緣之電極，並於射出成形時施加電場。在PVDF/PP聚摻物的射出成形實驗中，發現在模溫較低時，電場的施加將減緩PVDF分離相在充填後的流動行為，讓原本存在於剪切層的配向PVDF分離相開始出現於核心層。然而當模溫提升至150℃時，成品的高次構造呈現均勻的結晶形態，電場在此模溫未能保持PVDF分離相的配向。

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.