providing a window into the process
Some typical Melt Densities
Any inaccuracies in the melt density will be propagated proportionally along to the MFR
values. Thus a 1% error in the melt density means a 1% accuracy error in the MFR the
value.
Calculating PET Intrinsic Viscosity (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
.
P/N: M0726(3) | Rev: 012020 | ECO: 51182
www.dynisco.com
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