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Melt strength of calcium carbonate filled polypropylene melts
Author(s) -
Kao Nhol,
Chandra Arnab,
Bhattacharya Sati
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1057
Subject(s) - polypropylene , calcium carbonate , rheology , materials science , mixing (physics) , plastics extrusion , izod impact strength test , extensional definition , composite material , mineralogy , chemical engineering , chemistry , ultimate tensile strength , geology , paleontology , physics , tectonics , quantum mechanics , engineering
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