PAN - Intrinsic Viscosity

The PSL-RHEOTEK RPV-3 (2) with integrated iSP-1 can be used to determine the flow times of Polyacrylonitrile (PAN) samples dissolved in DMSO. The built-in RPV-3 software automatically calculates the kinematic, relative, specific, inherent and intrinsic viscosity - as per ASTM D2857, ISO 1628 Part 1.

Step by step

Solutions of PAN samples are prepared using the integrated Sample Preparation module (iSP-1), that allows accurate preparations of different concentrations e.g. 0.1000 g/dL, 0.1500 g/dL and 0.2000 g/dL in DMSO with a tolerance of 0.0005 g/dL in all preparations. Samples are then stirred in the heated reaction block (SD-1BM) for a pre-determined time and then immediately cooled down to the test temperature. 


Each sample measurement represents an average of two flow times measured consecutively in each position from the same preparation. The difference between the interim flow times from the mean represented by determinability (%) of the test number, demonstrates the precision of the flow time measurement. IV is determined through multiple solutions of samples by using the Kraemer and Huggins equations. The limiting value of inherent viscosity at an infinite dilution, when concentration is extrapolated to zero represents the intrinsic viscosity. Similarly, the limiting value of the reduced viscosity at an infinite dilution also provides the value for intrinsic viscosity.

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