As a result, IV parameter from dilute solution viscometer is not affected by the resin moisture content which removes the necessity of drying the samples before the tests.
IV measurement is normally performed by dissolution of a small amount of the polymer in an appropriative solvent (e.g. Intrinsic viscosity however is commonly used among the PET manufactures as the specification of different resin grades. As a result, the melt flow rate (MFR) parameters of PET resins are strongly affected by their moisture level/drying condition and rarely provided by their suppliers. Normally, the moisture acts as a plasticizer and increases the flowability of the plastic melt. This has a huge effect on the flow behavior and rheological parameters of the plastic melt. Polyethylene terephthalate (PET) is a hygroscopic resin from the polyester family which absorbs moisture onto their molecular structure when they are exposed to the ambient air.
Correlation of Melt Viscosity of Polyethylene Terephthalate to Solution Intrinsic Viscosity Azadeh Farahanchi Ĭorrelation of melt viscosity of polyethylene terephthalate to solution intrinsic viscosity
