“Intrinsic Viscosity”
Runs with PET
What is it?
Calculating PET I.V. from the Melt
Indexer
This feature allows the Melt Indexer to correlate Melt Flow Rate (g/10 min.) to
Intrinsic Viscosity (dl/g). Intrinsic Viscosity (IV, ASTM D3835) is a "wet
chemistry" technique used to assess the specific volume of an isolated polymer
chain, when dissolved in a good solvent. This value is directly related to the
molecular weight of the polymer. Melt viscosity or MFI measurement is
another, empirical (non-absolute like I.V.), way to assess molecular weight.
Melt Viscosity and Intrinsic Viscosity are related in such a way that IV can be
directly calculated from Melt Index values. This is described in greater detail in
the applications brief, "Correlating Melt Rheology of PET to Solution Intrinsic
Viscosity" by J. Reilly and P. Limbach, available from DYNISCO POLYMER
TEST on request.
1000
Melt Flow Rate vs.
IV PET
Homopolymer
100
MFR
(g/10 min)
10
1
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
I.V. (dl/g) (OCP 25C)
Series 4000 Melt Indexer Operation Manual
“Intrinsic Viscosity” Runs with PET
41
Содержание 4001
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Страница 76: ...GUIDE ROD FIGURE C Series 4000 Melt Indexer Operation Manual Instrument Maintenance and Troubleshooting 68 ...
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