IV of PET
The "IV" in "PET IV" stands for "Intrinsic Viscosity." Intrinsic viscosity is a measure of the molecular weight of a polymer. In the case of PET (Polyethylene Terephthalate), intrinsic viscosity is a critical parameter that correlates with the polymer's molecular weight distribution.
The introduction of recycled PET in industrial processes has increased the demand for reliable IV data from polymer processing plants. For accurate and reliable IV data there is no alternative to solvent based viscosity.
The PSL Rheotek RPV polymer viscometer provides full method compliance for Certificate of Analysis testing. The RPV viscometer automates every step of the test protocol of ASTM D4603 as well as ISO 1628 part 5. Other method protocols available on request.
RPV Polymer viscometers listed below are suitable for IV of PET.
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IV of PET
PET - Intrinsic Viscosity - ASTM D4603 and ISO 1628 - 5. The PSL Rheotek RPV-3 determines the Inherent & intrinsic Viscosity of Poly (Ethylene Terephthalate)/PET in dilute solution using glass capillary viscometers in accordance with ASTM D4603.
Concentration
The test method requires a 0.5% concentration of PET dissolved in 60/40 phenol/1,1,2,2-tetrachloroethane solution. Solvent and solution flow times are measured at 30 deg. C using the same 1B size of suspended-level Ubbelohde type viscometer for both measurements.
Repeat flow times
The method requires that three successive flow times are obtained within 0.2s of the mean. The RPV-3 software automatically calculates the Intrinsic Viscosity from each single determination using the Billmeyer equation.
The dual position RPV-3 (2) is an ideal configuration. This provides for running duplicates in parallel of prepared samples. Employing this practice guarantees instant Quality Assurance of the work carried out in the plant laboratory. On the four position system, RPV-3 (4), it is possible to run 2 duplicates.
Weight to weight sample preparation
The iSP-1 Sample Preparation system can be used in conjunction with the RPV-3. Sample ID is captured at the outset and provides instant traceability of test parameters. Samples are prepared on a weight to weight basis.
Dissolution is carried out using a reaction block with stirring and heating at 110 deg. C with a programmable timer. (SD-BM).
What solvents do I need?
The test method requires a 0.5% concentration of PET dissolved in 60/40 phenol/1,1,2,2-tetrachloroethane solution. Chloroform and Acetone are typically used for cleaning and drying the sample path on completion of the measurement.
What is the temperature of measurement?
Solvent and solution flow times are measured at 30 degrees C. Temperature control is achieved using a constant temperature viscometer bath.
What are the installation requirements?
Inside a fume hood, which is located in an air-conditioned laboratory with a stable temperature.
How long does it take to run an IV test?
A complete test cycle takes approximately 30 minutes using the PSL Rheotek RPV Polymer Viscometer. After 30 minutes, you can load a new sample in the viscometer.
Can I measure IV without using solvents?
The term IV refers to solvent based viscosity. True IV can only be measured by dissolving a small polymer sample in an appropriate solvent and the running a relative kinematic viscosity in a glass capillary viscometer.