RPV-1 (Gen 2) Rheotek Pulp Viscometer Degree of polymerization of new and aged papers
The PSL Rheotek RPV-1 Pulp Viscometer determines the average viscometric degree of polymerization (DP) of new and aged cellulosic electrically insulating papers in dilute solution using glass capillary viscometers in accordance with IEC 60450 and ASTM D4243.
RPV-1 (Gen. 2) Pulp viscometer with nitrogen purging system (situated on right hand side of bath)
RPV-1 Configuration The RPV-1 Pulp Viscometer System includes the following integrated modules: • • • • • • • •
EVS Viscometer bath with internal solid-state cooling Nitrogen purging system Viscometer Control Module Measuring heads with nIR optoelectronic detection Filling stations – for sample addition WIN 10 PC system with comprehensive software PIAB pump (requires compressed air, or optional vacuum pump
Subject to PSL’s terms and conditions. Technical changes may apply.
The cellulose is dissolved in Cupriethylenediamine (Cuen) and water, an alkaline solution. This solution will be sensitive to oxidation and it is essential that the viscometer is purged thoroughly with nitrogen. Solvent and solution flow times are measured at 20 deg. C typically using a size 1 suspended-level Ubbelohde type viscometer for both measurements. The method requires that two repeat flow times are obtained within 1% precision. A repeat of the method is required with a fresh specimen of sample. The two results should agree to within 1% of each other The RPV-1 software automatically calculates the Intrinsic Viscosity from Martin's Formula. Using the pre-programmed Mark Houwink constants, the Average Degree of Polymerization (DP) is ……making precision routine also calculated and reported. The dual position RPV-1 (2) Pulp Viscometer (with nitrogen purge) is an ideal configuration for this method combined with a wrist action shaker and the iSP-2 Pulp Sample Preparation system.
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