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The measurement of melt flow and melt stability
Author(s) -
Longworth Ruskin
Publication year - 1974
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.760140204
Subject(s) - materials science , rheometer , body orifice , flow (mathematics) , composite material , newtonian fluid , melt flow index , stability (learning theory) , mechanics , rheology , mechanical engineering , engineering , polymer , machine learning , computer science , physics , copolymer
The melt flow of a plastic as measured by the standard method (ASTM D‐1238) is at a high enough stress so that the flow is non‐Newtonian. If the die in the plastometer is replaced by a nonstandard, tapered die of large orifice, a lower stress can be used and the flows are shown to be comparable to Newtonian viscosities measured in a cone and plate rheometer. Under these conditions the plastometer can be used as a sensitive measure of the melt stability of a plastic.