Under temperatures of 100°C ∼ 310°C and apparent shear rates of 60s-1∼ 1000s-1, the melt flow properties and their effects on the extrusion of two different types of polycarbonate (PC) resins are studied using a capillary rheometer. The results indicate that the shear flow property of the melts follows the Newtonian flow law. Under the same extrusion conditions, the end effect caused by the higher molecular weight (Mw) melt is relatively more significant than that of the lower Mwmelt. On the other hand, the viscosity of the lower Mwmelt is comparatively more sensitive to temperature change. On the basis of the experimental results, a mathematical model that describes the relationship between the shear viscosity and the temperature of PC is proposed. Thus, this model can be used as a practical tool for the injection moulding of PC resin.
ASJC Scopus subject areas
- Ceramics and Composites
- Computer Science Applications
- Metals and Alloys
- Industrial and Manufacturing Engineering