How can we find the values of constants for PVDF-DMF from the Mark-Houwink equation?

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Solution of 2D convection diffusion heat equation using MATLAB ?

This is a polymer heating problem. Polymer enters at around 180C (x=0) in the barrel. Also barrel initial temperature is 180 (t=0). Some heat Is added along whole length of barrel q. We have to...

15 February 2021 3,887 1 View

Paper about future and challenges of batteires?

I am looking for a recent paper that describes the challenges facing batteries' progress and all about the future of batteries.

11 January 2021 1,809 1 View

Who to create single SPSS data sheet for different measures by two different populations??

I am working on Effect of parents personality patterns on adolescents, I have collected data from parents and adolescents by using different scales on both population. Now I have to create SPSS...

26 December 2020 7,238 3 View

Why is light pure energy?

light is pure because the light is the simplest electromagnetic construct but the energy of any object is also of the same kind.

20 December 2020 207 4 View

Can we design a solar cell with undoped c-si ?

i would like to realize a solar cell made of : SiO2 as a protective layer and ITO as an ARC, undoped c-Si as an active material, and Ag as back reflector, can I use undoped c-Si as an active...

21 September 2020 2,687 4 View

How to make a numerical study about solar cells gratings?

I am looking for a free software for students or generally make free to make a numerical study which means to simulate solar cells gratings in order to enhance solar cell efficiency by light...

08 September 2020 4,032 3 View

What can we call this type of surface morphology formed in Cu2O at high laser power during the SLM process?

A kind of surface roughness is produced by the application of laser energy density at high laser power (> 140W) which looks like an open porous structure. This kind of structure is not observed...

18 August 2020 9,835 4 View

How to simulate plasmonic solar cells with silvaco?

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14 August 2020 9,842 5 View

Dear friends I'm looking for help in my research, would please suggest some solutions?

I'm doing a study on the effect of job stress on job performance of police officers in Iraq and i need a good scale to measure the job performance.suggestion for the development of my work or...

02 August 2020 9,001 3 View

Other ways to check DNA quality? How long can I store human stool samples?

Due to the pandemic, I can't go back to my university to conduct experiments. I have my stool samples and extraction kit with me in a smaller laboratory however they don't have the equipment I...

07 July 2020 5,172 1 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

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02 March 2021 4,910 3 View

Modeling viscosity using model of Chung?

Hello, As part of simulation of gases mixture and water, I need to calculate viscosity of the fluid components and I am using relationships proposed by Chung et al. (1988). The irony is while I...

25 February 2021 8,053 5 View

What is the suitable range of Sulfur content and Viscosity of Heavy fluid Oil that used in Kiln?

What is the disadvantages of high sulfur content to the ceramic burning process? and what is the effect of outranged viscosity?

24 February 2021 8,219 2 View

How to determine number concentration of polymer solutions using viscosity experiment?

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19 February 2021 5,205 5 View

Simulation of melting process in CFD ?

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03 February 2021 8,109 3 View

How to choose proper spindle for measurement of thixotropic behavior of ceramic slurry?

Hello, we are studying on thixotropic behavior of ceramic slurry . We will perform the thixotropic behavior analysis of ceramic slurry with the density of 1,7 g/ml by using BROOKFIELD DV2T. How to...

08 January 2021 1,776 5 View

HOW MWCNT affects on the solution viscosity?

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04 January 2021 5,231 3 View

Viscosity of polyester polyol?

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04 January 2021 8,825 5 View

Does capillary blood appear more or less viscous the higher the glucose level?

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04 January 2021 832 3 View

How to calculate "POWER LAW" in rheology from a GRAPH of shear rate vs viscosity for cellulose nanofibrils suspensions?

02 January 2021 6,816 3 View

Jasim Ahmed

For average MW determination, you do need measurement using capillary viscometer. Rheometer provides you the apparent viscosity or the complex viscosity (SAOS). You cannot use rheometer viscosity for MW calculation.

Ibukunoluwa Fola Olawuyi

Viscosity average molecular weight determination requires intrinsic viscosity measurement and not apparent viscosity. Ubbelohde viscometer is commomly used. Check this link (http://www.ampolymer.com/Mark-Houwink.html) for a shortlist of polymer-solvent constants. It is important that your polymer is able to completely dissolve in the selected solvent.