Method Development to Evaluate Melting Behavior of Glass Fiber-Reinforced Syndiotactic Polystyrene Composites in the Presence of Pressure Loading

Abstract

Criteria of cycle time include metering, closing a mold, packing, holding, cooling, opening a mold and ejecting. Interestingly, metering time was found relatively lengthy in the composite of glass fiber (GF)-reinforced syndiotactic polystyrene (sPS) during injection molding. It was motivated by the ideas that analyzing dynamic thermal property may provide the correlation with metering time because differential scanning calorimeter does not fully provide dynamic thermal property. We created new measuring system to examine thermal behavior in the presence of pressure loading. The method was very effective to determine the melting rate of thermoplastics in the presence of pressure loadings.

Keywords:

• Injection molding
• Melting rate under pressure
• Metering time
• Polyphenyl oxide (PPO)
• Syndiotactic polystyrene (sPS)

Notes

Note: digits were shown as truncated integer for the purpose of simple comparison.

^a Difference was defined to the property changes before and after PPO added to sPS/GF composite. The values were calculated by .