| 초록 |
Syndiotactic polystyrene (sPS) is a semi-crystalline polymer with polymorphism. The melting rate and the crystallization rate of sPS are relatively low compared with other conventional semi-crystalline polymers such as PBT. The cycle time of the injection molding process of sPS is also long due to the low melting and crystallization rate. So reducing cycle time of the injection molding process of sPS is a very important issue. In this work, we have studied the melting rate kinetics of sPS in order to control the melting behavior of sPS in the composite of sPS and glass fiber. Differential scanning calorimetry (DSC) or temperature modulated DSC is a good tool for studying melting kinetics. However, these methods are time consuming as well as expensive. In this work, we present a simple kinetic model and an experimental method so called a pin pressure method for the analysis of melting behavior of sPS in the composite of sPS and glass fiber. We also employ DSC for the analysis. By controlling the melting behavior of sPS in the composite, we can obtain the cycle time reduction of an injection molding up to 15%. |
