Melt extrudate swell behavior of polypropylene composites filled with hollow glass beads

作者：Liang, Ji Zhao^*; Zhong, Ming Qiang

来源：Journal of Polymer Engineering, 2012, 32(4-5): 259-263.

DOI：10.1515/polyeng-2012-0005

• composite
• extrudate swell
• hollow glass bead
• melt extrusion
• polypropylene

Polypropylene (PP) composites filled with hollow glass beads (HGB) were prepared by means of a twin-screw extruder. The extrudate swell ratio (B) of the PP/HGB composite melts was measured using a melt flow indexer under experimental conditions, with temperatures from 190 degrees C to 230 degrees C and loads varying from 1.20 kg to 7.50 kg, to identify the effects of the extrusion conditions and the particle size and content on the extrudate swell of composite melts. The results showed that the value of B of the composites increased nonlinearly with an increase of shear stress, while it decreased linearly with a rise of temperature. When the load and temperature were constant, the value of B increased nonlinearly with an increase of the HGB diameter, whereas it reduced nonlinearly with an increase of the HGB volume fraction. This should be attributed to the elastic deformation energy stored in the flow of the composite melts, which was decreased with an increase of the HGB number and content.

• 出版日期2012-8
• 单位华南理工大学