Polymer viscosity - Intrinsic Viscosity




- Benchtop Unit (Small Footprint)
- Variable Temperature Selection from 20°C to 100°C
- (135°C with High-Temperature Option)
- Viscosity Range of 0.3 to 20,000 cSt*
- ASTM D 445 Precision
- Powerful VISCPRO® forWindows® Software
- CE Marked for Safe, Reliable Performance


The CANNON® PolyVISC® Automatic Glass Capillary Viscometer combines automatic sampling, viscosity measurement, viscometer washing, and polymer solvent compatibility to provide a convenient benchtop unit ideal for dilute solution polymer viscosity analysis. Both transparent and opaque samples can be measured with the accuracy required by ASTM D 2857 and many other application-specific methods. Infrared optical sensors are used for all transparent samples and some opaque samples. Thermal sensors are available upon request for heavily opaque samples.
The PolyVISC utilizes a unique "air bath" technology to maintain excellent temperature control. Analyses are made in an ultra-stable thermostatic air chamber (the AIRBATH®). The AIRBATH consists of an outer insulated chamber enclosing a second, inner chamber, where the viscometer and sample are continuously bathed in a thermally stabilized stream of air. Temperature is controlled within 0.01°C with advanced measuring electronics, thermoelectric cooling, and controlling software. Because both the sample carousel and the viscometer are completely contained in the AIRBATH, only the first sample requires a delay for thermal equilibrium. The AIRBATH also allows rapid temperature and viscometer changes. Built-in thermoelectric cooling enables testing below 40°C without the need for an external chiller.

Overview of Automatic Sample Loading and Analysis
Samples are placed in disposable vials which are then loaded into a carousel and inserted into the AIRBATH for analysis. The carousel accepts eleven vials, each containing 10 to 15 mL of sample. The extended-range viscometer used in the PolyVISC is similar to that in the CANNON Automatic Viscometer (CAV). The viscometer contains a lower and an upper timing bulb. First the sample is pulled into the lower chamber of the viscometer. The time required to fill the lower bulb is measured. If the time is short, the sample is pulled into the upper bulb. If the time is long, the lower bulb is used. Each PolyVISC viscometer covers a 100-fold viscosity range. This means that a single size 1-100 PolyVISC viscometer can analyze a range of samples that would require five manual viscometers. Viscometers can be easily changed in less than 60 seconds without the inconvenience of messy bath liquids.
After each analysis is completed, the sample flows back into the sample vial. Residual sample is cleaned from the inside, outside, and tip of the viscometer by automatic rinsing with a wash solvent, followed by a drying solvent. The viscometer is then dried. A typical wash requires only 10 to 20 mL of washing solvent and 10 mL of drying solvent. Wash parameters are adjustable by the user.