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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 >>

FAQ - Frequently Asked Questions


Q1- I learned to think about rheological properties in my mind by relaxation times λ and Maxwell model. Is this way to evaluate wrong method?

No, relaxation times are good and descriptive way to get in estimations of material properties and for educational purposes. The true behaviour of polymer is more complicated and always non-linear for any type modifications of Maxwell model and thus not usable for analyses of polymer structures.

This topic is discussed shortly on the wirefames for models page and more thoroughly on the published papers.

Q2- Why is used only complex modulus G* or viscosity η* data and lost valuable information included in the elastic G'(ω) and viscous G''(ω) components?

We have proven that the measured partition of G' and G'' is not accurate although computed dynamic moduli G* is precise. In other words, some amount of viscous response is actually detected as elastic force or on the contrary. Moreover with RheoPower is possible to get modelled G' and G'' to all types of flows impossible to measure as a function of shear rate and elongation rate.

Relaxation modulus and spectrum are calculated later on by the formulas shown in published papers and not used elsewhere in the principle.

Q3- Is there used any internal relaxation time λ, function or spectra in RheoPower?

No, but the polymer structure function P(ω) is fingerprint of polymer structure. P(ω) is composed elastic P'(ω) and viscous P''(ω) functions giving viscoelasticity not only for dynamic measurements, but as a function of shear rate or time for different type of polymer flows.

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