Melt strength of calcium carbonate filled polypropylene melts

✍ Scribed by Nhol Kao; Arnab Chandra; Sati Bhattacharya

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 147 KB
• Volume: 51
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/pi.1057

✦ Synopsis

Abstract

This paper investigates the extensional rheology (through melt strength measurement) of calcium carbonate (CaCO~3~) filled polypropylene (PP) melts. Different concentrations of CaCO~3~ filled PP were produced by mixing two master batches of pure PP and 70 wt% CaCO~3~ filled PP in required proportions in a counter‐rotating twin‐screw extruder. It was found that the melt strength of the CaCO~3~–PP melts was independent of CaCO~3~ concentrations up to 25 vol%. Further increase in CaCO~3~ concentration led to a severe reduction of melt strength.

© 2002 Society of Chemical Industry