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LATEST NEWS

16th April 2017
Tommi Borg visits for your meetings at Chinaplas May 16-19, 2017 - Guangzhou, PR China.

24th November 2015
New published paper "Linear viscoelastic model for different flows based on control theory", Appl. Rheol. Read more >>

7th November 2014
RheoPower 4.3 is also available as true 64-bit for heavy computations. Read more >>

20th August 2014
Tommi Borg gives an oral presentation at The International Conference on Polyolefin Characterization (ICPC) September 21-24, 2014 - Valencia, Spain. >>

30th October 2013
New RheoPower 4.2 produce accurate MWD by Multi-Record Analyze. Read more >>

Multi-Record Analyze

Fresh improvements to get Molecular Weight Distribution (MWD) and Rheologically Effective Distribution (RED).

The lack of Measured Datapoints in Rheology

We get only some dozens datapoints with single frequency sweep or capillary measurement. Fortunately specially oscillation rheometer is itself rather sensitive.

The geometry of polymer sample can still vary during a single frequency sweep run, which may be more severe error source. The absolute viscosity values vary between separate measurement runs due to variation of sample dimensions, but that is not problem for elegant RheoPower principle as it uses only relative data values at different rates or frequencies.

Multi-Record Analyze results for several MWDs.

Solution for the problem is to use several frequency sweep runs carried even at different temperatures, where new one click importing of XML records makes complete procedure fast and easy for multi-record analyzes giving higher accuracy for the MWD/RED results.

Jointing data from different rheometers and devices

The same principle is valid with data gained with other type rheometer and measurements. Already has been possible to give priori information for MWD, but now is possible to join data from different sources.

According to linear RheoPower principle is possible to convert viscoelastic data on different scales to MWD by using procedure depending on the structural factor Mf and flow transition factor Hf.

Software Package Version Rearrangements

Multi-Record Analyze is now as default in Premium version distribution package. Earlier Go-mode of Computation is available as option as although procedure is elegant, used a lot of numerical procedures and efforts in the developing work, the lack of measured datapoints makes computation procedure labile in the many cases.

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