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Flame retardation of polypropylene: Effect of organoantimony compounds on the melt flow behavior
Author(s) -
Jha N. K.,
Misra A. C.,
Bajaj P.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260412
Subject(s) - materials science , polypropylene , melt flow index , composite material , viscosity , shear rate , elasticity (physics) , die swell , polymer , plastics extrusion , copolymer
The melt flow behaviour of polypropylene filled with organoantimony compounds, triphenylstibinedibromide and its derivatives with tribromo‐, trichloro‐, and pentachloro‐phenols, as flame retardants has been studied in the temperature range of 180 to 220°C, and at shear rates of 29.5 to 588.8's −1 , using a capillary rheometer. A decrease in the melt viscosity at all shear rates and temperatures was noticed on addition of these flame retardants, The melt viscosity further decreased upon increasing the concentration (from 5 to 20 phr) of the flame retardants. The die swell was measured in order to determine the melt elasticity of the filled systems. The minimum melt viscosity of filled propylene was observed approximately where the maximum die swell (melt elasticity) occurred.